Recurrent pregnancy loss (RPL) affects approximately 5% of couples and is an emotional burden on those affected. There is some evidence that vaginal progesterone supplementation may be considered in patients with recurrent pregnancy loss who are experiencing vaginal bleeding during the first trimester. But what about prophylactic low dose aspirin in the first trimester, or preconceptionally, for unexplained RPL? Is that evidence-based? A new publication from the SMFM’s journal Pregnancy has examined this. Listen in for details.

1. 22 November 2025: Low-dose aspirin in unexplained recurrent pregnancy loss: A systematic review and meta-analysis (Pregnancy): https://obgyn.onlinelibrary.wiley.com/doi/10.1002/pmf2.70099

2. American College of Obstetricians and Gynecologists’ Committee on Obstetric Practice, T. Flint Porter, Cynthia Gyanff-Bannerman, Tracy Manuck. Low-Dose Aspirin Use During Pregnancy. American College of Obstetricians and Gynecologists (2018)

3. Naimi AI, Perkins NJ, Sjaarda LA, et al. The Effect of Preconception-Initiated Low-Dose Aspirin on Human Chorionic Gonadotropin-Detected Pregnancy, Pregnancy Loss, and Live Birth : Per Protocol Analysis of a Randomized Trial. Annals of Internal Medicine. 2021;174(5):595-601. doi:10.7326/M20-0469.

4. Lee EE, Jun JK, Lee EB.Management of Women With Antiphospholipid Antibodies or Antiphospholipid Syndrome During Pregnancy. Journal of Korean Medical Science. 2021;36(4):e24. doi:10.3346/jkms.2021.36.e24.

5. de Assis V, Giugni CS, Ros ST. Evaluation of Recurrent Pregnancy Loss. Obstet Gynecol. 2024 May 1;143(5):645-659. doi: 10.1097/AOG.0000000000005498. Epub 2024 Jan 4. PMID: 38176012.