Could I be pregnant???

Nicole
I had sex 3 days before I ovulated which was on 8/15/16.. Had sex 8/10/16 8/13/16 and 8/14/16... Could I be pregnant I have 25 day cycle bleeding for 4days. Just need some help tingly sore breast nauseous in the morning and after and just started vomiting today but at night its not bad just some mild headaches increase in cervical mucus!!!