Sex before period

Ladies i need help

Ive heard it's impossible to get pregnant days before your period. Sooooo

I was suppose to get my period 3/13

My hubby and i had sex 3/10 by mid night i started spotting i thought maybe ima get my period i wasn't home and i was at a hotel cause i visit my hubby from another state since he was out for work. Anyway i was at the hotel my cup only a tampon i didnt want to use cause it wasn't enough of a period. so by the morning again spotting a little more so i said okay ima use the tampon run to target buy a cup and when i went back the tampon had no blood only a tuny dot at the top. And that was so no period i had sex again that day and he finished but i we i started bleeding. Mind yall he finish in me both times. Sunday almost nothing Monday no period only spotting Tuesday nothing and Wednesday and Thursday light pink spotting. Ive never had this happen and i cant be pregnant because i hadn't had sex 3 weeks and we would use condom or he would finish other ways . He was away.... so ever since we had sex i've been cramping and since yesterday i feel my boobs tingling then it goes away or the feel like it wasnt so to hurt and then it goes away today i started with lower back pain and my right lower abdomen is cramping. And i had yellowish discharge very stretchy can this be signs of early pregnancy??