Advice needed

Hi I’m 16 years old I’ve been with my boyfriend on and off for 4 years and we started dating when we were 13 and I recently started having sex I had my first period when I was 11 and ever since I’ve been having irregular periods but then sometimes I’ll have regular periods I had un protective sex and he pulled out fast and cum came out but he wasn’t sure if he cumed a little bit inside me he ask for me to check and I did but I wasn’t sure if it felt different or no I don’t know if it’s supposed to feel different or not and I had my period the end on dec and ended January 3rd NEED ADVICE!!!!! Please