Help! This was on my underwear after sex

Girls! Please help me.. so me and my man had sex last night, and after sex I found this on my underwear. We do the pull out method but I’m sure he didn’t cum inside me because he never did finish. After he pulled out I also felt something coming out of my vagina but wasn’t sure about it. Me and my man have been together for 2 years and this method is what we’ve been using all these years. He is a rockstar at it but I’m not sure what this was on my underwear. Please help me if you know