My bf came in me but I am on birth control and never mess it up ever.

He came in me around 3 days after my period ended.

I usually get my period the same time.

How long should I wait before I get nervous ? & I've read it's normal to not get your period when you're on birth control for a month or even two months but I usually get it and have been on birth control for like two years.

I hadn't had anyone cum in me for like a year until this time so could that have messed up my cycle ?

Anyone have/had a similar situation.

What are your thoughts on mine ?