LATE PERIOD HELPPPPP

Had sex on my period, he didnt cum inside. and then had sex gain during my ovulation day but we used condom, he also didn't cum inside of me. We checked the condom, nothing is wrong with it. The problem is, Yesterday should be the date of my period but still, no period til today. :( My lower back aches and my boobs too. I am 18, still studying and I am not ready for a child. I'm afraid that I touched my vagina after I touched his.. Could I be pregnant? Thanks. 😣😣😣