possibly of being pregnant?

Okay so today , I was having sex with this guy and he always pulls out before he finishes and usually it's on my leg or my ass or something , but this time it kinda slid down and got onto my vagina . I noticed like , as soon as it happened and I wiped a little off and sat there until he got me paper towels , cleaned up , and then peed . Should I be worried ? There's also a big possibility that it wasn't his that slid down and what I felt was mine because I had just finished , but there's always a chance you know ??? Am I being crazy?????