I have alot of pressure and mild cramps where my uterus is I had unprotected sex I missed a few days of pills am I pregnant possibly?

Do pregnancy test. If you missed your period by more than 5 days, do a home pregnancy test. If it is negative, repeat the test in 4-5 days, unless you get your period by then. Use first morning urine and follow the instructions for the test carefully. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex. Get HPV vaccine.