not sure how long spermicide lasts.

So here's my story:
Last night was the first time seeing my girlfriend in about a week, and we decided to "celebrate". She convinced to me have sex without a condom because she had just had her period and she said that their was virtually no chance of pregnancy. So we had sex twice, without a condom, and I pulled out each time. I'm pretty worried right now, but I'm curious as to whether or not I should be worried, or if I'm just over thinking it?
On a side note: at the beginning of the night I had used a condom with spermicide on it, I'm not sure how long spermicide lasts and whatnot, but I thought that it's worth mentioning.