So, I am 18 for the record. My last period was December 2nd. On December 19th I was low fertility and Me and my boyfriend did stuff. I have him head and he came in my mouth, and then I kissed him and immediately after he went down on me. My period hasn’t came yet, and it was apparently supposed to come on the 29th even though i already had it December 2nd. Am I worrying too much? Is it even possible to get pregnant that way?