Low chance right?

So I had my first one night stand on Thursday night. I had missed the previous weeks birth control pill, but I took it consistently for the week of. I gave him head and he finished in my mouth and I kept going for a while after (he said he liked that). Then he went inside me for maybe a minute or two. I think its low chances, but I just want some advice. The following Sunday I kind of had white discharge, that I think I've had before, so I don't think I should worry. I think I'm just freaking myself out, what do y'all think?