Thoughts on the sponge?

Ellie
So I came across the Today Sponge at CVS today and I thought about Seinfeld and how much Elaine loves them. I'm currently on the pill but sometimes forget to take it. Lately I've been very good at taking it at the same time everyday. I bought the sponges and thought maybe if combined with the pill my boyfriend could finish inside and not have to worry. Normally he pulls out during orgasm, but it sort of kills the mood for both of us. We have used condoms but at times they irritate my vagina, and again, it kills the mood to stop and put it on. My doctor thinks it will be more than effective, but I still get nervous. What do you all think? 
Thanks!