Accident

I have a 2 1/2 yr old, a 3 month old and we have been using the pull out method. Which weve always done. Welk the other night, i partied for the first time since i got pregnant with my first. And of course we had sex. And when he pulled out so i could take it in my mouth i noticed he already came. :-/ and when i took my shower i couldnt tell from my juices from his. So now im freaking out.