Lpeers, I had that happen on Lyrica. My period lasted the whole 2 weeks I was on the Lyrica - despite the fact that I was taking birth control pills at the same time. My period didn’t stop till I stopped the Lyrica. The pharmacist said it can happen with some drugs. That said, I’m taking gabapentin (which is related to Lyrica) now (not a high dose) and haven’t had any problems. It may be that you need to try a different med in the same group.