Regan L, Rai R, Saravelos S, Li TC; Royal College of Obstetricians and Gynaecologists. Recurrent Miscarriage Green-top Guideline No. 17. Br J Obstetrics Gynecol 2023 Nov;130(12):e9-e39. https://doi.org/10.1111/1471-0528.17515.

Linehan LA, San Lazaro Campillo I, Hennessy M, Flannery C, O’Donoghue K. Reproductive outcomes following recurrent first-trimester miscarriage: a retrospective cohort study. Hum Reprod Open 2022;2022(4):hoac045.

Navya G, Raghuwanshi N, Chavan R. Clinico-epidemiological profile and evidence based management of recurrent miscarriages in a tertiary care centre. Int J Adv Res 2023; 11(05):613-627. https://www.journalijar.com/article/44810/

Ali S, Majid S, Ali NM, Taing S, El-Serehy HA, Al-Misned FA. Evaluation of etiology and pregnancy outcome in recurrent miscarriage patients. Saudi J Biol Sci 2020;27(10):2809-17. https://doi.org/10.1016/j.sjbs.2020.06.049

Tsonis O, Balogun S, Adjei JO, Mogekwu O, Iliodromiti S. Management of recurrent miscarriages: an overview of current evidence. Curr Opin Obstet Gynecol 2021;33(5):370-7. https://doi.org/10.1097/GCO.0000000000000735.

Patki A., Chauhan N. An epidemiology study to determine the prevalence and risk factors associated with recurrent spontaneous miscarriage in India. J Obstet Gynecol India 66 (2016), pp. 310-315, https://doi.org/10.1007/s13224-015-0682-0

Barnhart KT, Katz I, Hummel A, Gracia CR. Presumed diagnosis of ectopic pregnancy. Obstet Gynecol 2002;100(3):505-10. https://doi.org/10.1016/S0029-7844(02)02142-7

Arab H, Alharbi AJ, Oraif A, Sagr E, Al Madani H, Abduljabbar H, et al. The role of progestogens in threatened and idiopathic recurrent miscarriage. Int J Womens Health 2019;11:589-96. https://doi.org/10.2147/IJWH.S224159

Condous G, Kirk E, Lu C. There is no role for uterine curettage in the contemporary diagnostic workup of women with a pregnancy of unknown location. Hum Reprod 2006;21(10):2706-10. https://doi.org/10.1093/humrep/del223

Nelson DB, Hanlon AL, Wu G, Liu C, Fredricks DN. First trimester levels of BV-associated bacteria and risk of miscarriage among women early in pregnancy. Matern Child Health J 2015;19(12):2682-7. https://doi.org/10.1007/s10995-015-1790-2

Giakoumelou S, Wheelhouse N, Cuschieri K, Entrican G, Howie SE, Horne AW. The role of infection in miscarriage. Hum Reprod Update 2016;22(1):116‐33. https://doi.org/10.1093/humupd/dmv041

Thangaratinam S, Tan A, Knox E. Association between thyroid autoantibodies and miscarriage and preterm birth: meta-analysis of evidence. BMJ 2011;342:d2616. https://doi.org/10.1136/bmj.d2616

Barbosa MWP, Valadares NPB, Barbosa ACP, Amaral AS, Iglesias JR, Nastri CO, et al. Oral dydrogesterone vs. vaginal progesterone capsules for luteal-phase support in women undergoing embryo transfer: a systematic review and meta-analysis. JBRA Assist Reprod 2018;22(2):148‐56. https://doi.org/10.5935/1518-0557.20180018

Maconochie N, Doyle P, Prior S, Simmons R. Risk factors for first trimester miscarriage results from a UK-population-based case-control study. Br J Obstet Gynecol 2007;114(2):170-86. https://doi.org/10.1111/j.1471-0528.2006.01193.x

Lucovnik M, Kuon RJ, Chambliss LR, Maner WL, Shi SQ, Shi L, et al. Progestin treatment for the prevention of preterm birth. Acta Obstet Gynecol Scan 2011;90(10):1057‐69. https://doi.org/10.1111/j.1600-0412.2011.01178.x

Abrar S, Abrar T, Tahir M, Sayyed E. Efficacy of oral with vaginal progesterone in the treatment of threatened miscarriage in first trimester. Pak J Med Sci 2017;25(4):407-10. https://doi.org/10.12669/pjms.37.3.3700

Di Renzo GC, Giardina, I, Clerici G, Brillo E, Gerli S. Progesterone in normal and pathological pregnancy. Hor Mol Bio Clin Investig 2016;27(1):35-48. https://doi.org/10.1515/hmbci-2016-0038

Schumacher A, Costa SD, Zenclussen AC. Endocrine factors modulating immune responses in pregnancy. Front Immunol 2014;5:196. https://doi.org/10.3389/fimmu.2014.00196

Yassaee F, Shekarriz-Foumani R, Afsari S, Fallahian M. The effect of progesterone suppositories on threatened abortion: A randomized clinical trial. J Reprod Infertil 2014;15(3):147.

Dante G, Vaccaro V, Facchinetti F. Use of progestagens during early pregnancy. Facts Views Vis Obgyn 2013;5(1):66-71.

Ghosh S, Chattopadhyay R, Goswami S, Chaudhury K, Chakravarty B, Ganesh A. Assessment of sub-endometrial blood flow parameters following dydrogesterone and micronized vaginal progesterone administration in women with idiopathic recurrent miscarriage: a pilot study. J Obstet Gynaecol Res 2014;40(7):1871‐6. https://doi.org/10.1111/jog.12456

Wang XX, Luo Q, Bai WP. Efficacy of progesterone on threatened miscarriage: difference in drug types. J Obstet Gynaecol Res 2019;45(4):794-802. https://doi.org/10.1111/jog.13909

Wahabi H, Fayed A, Esmaeil A, Al-Zeidan A. Progestogen for treating threatened miscarriage. The Cochrane Database of Systematic Reviews 2011;12:CD005943.005943. https://doi.org/10.1002/14651858.CD005943.pub5

El-Zibdeh MY, Yousef LT. Dydrogesterone support in threatened miscarriage. Maturitas 2009;65(1):S43-6. https://doi.org/10.1016/j.maturitas.2009.11.013

Lee HJ, Park TC, Kim JH, Norwitz E, Lee B. The Influence of Oral Dydrogesterone and Vaginal Progesterone on Threatened Abortion: A Systematic Review and Meta-Analysis. Biomed Res Int 2017;3616875. https://doi.org/10.1155/2017/3616875

Kasap E, Karaarslan S, Gene M, Gur EB, Sahin N, Guclu S. The role of cytokines in first trimester pregnancy losses with fetal chromosomal anomaly. Ginekol Pol 2015;86(11):827-32.