Scared 😓

So I'm 18 and recently my period is about 12 days late which quite weird for my cycle but has happen once before last year as of right now I'm in between birth controlls so I've been practicing the pull out method. My SO and I have been dating for a year and I trust him. He  did not cum in me he is 100% sure and I'm quite confident my self  but recent time he did in my crese of my inner thighs around the lip area and was wiped imeadiatly should I be worried