Chansell
I highly doubt the vest has any bearing on fertility. i was(am) using it once or twice a day last month and I got pregnant. It shakes your upper abdomen, not your lower pelvic region and besides, you aren't using it during sex and probably not in the few minutes after sex that it takes the sperm to get into the uterus. I believe I read once that it takes the sperm a few hours to reach the fallopian tubes. Anyway, for me it didn't affect fertilization or implantation.