UC Davis

Objective

To evaluate pregnancy risk following copper (CuT380A) intrauterine device (IUD) placement 6-14 days after unprotected intercourse.

Study design

We used a combined dataset from four protocols in which participants had received a CuT380A IUD regardless of recent unprotected intercourse. At entry, participants had negative point of care urine pregnancy testing and reported all acts of unprotected intercourse in the two weeks prior to IUD placement. We identified a subset of women who had placement 6-14 days after unprotected intercourse and provided follow-up information on pregnancy status 2-4 weeks after IUD insertion. This follow-up within the four protocols included self -administered home urine pregnancy test (UPT) results 2-4 weeks after IUD placement or continued contact for up to 6 months.

Results

We identified 134 women who had a CuT380A IUD placed 6-14 days after unprotected intercourse and provided follow-up information on pregnancy status. Ninety-five (71%) participants reported UPT results 2-4 weeks after placement and the other 39 women were followed for 6 months after IUD placement to assess pregnancy status. Zero (97.5% CI 0-2.7%) participants reported a pregnancy within four weeks of CuT380A IUD placement.

Conclusion

In these collected data, no women with recent unprotected intercourse became pregnant within 1 month of CuT380A IUD placement.

Implication

These data indicate a low likelihood of pregnancy among women who reported unprotected intercourse 6-14 days preceding IUD insertion. For many women and their providers, these data may be sufficient to support same-day placement of a copper IUD rather than delaying IUD placement until the next menses.