That's how I got pregnant after 1yr of trying. Tried it once and two weeks later I had a bfp! I was going to try them with preseed the next cycle to up my chances but I didn't even have to do that! Before trying 1 year, we were very lax on contraception for 8 years and I never got pregnant then. My DH tested ok, so I knew that I was the one with some sort of unfriendly environment, hehe. I got tired of keeping my legs up for hours after, and just spent the $14 on the instead cups. Used two out of the pack and now I have an eight month old