pregnancy or period symptoms???

So my period is late by 2 days.. about a month ago i had unprotected sex on my period but it was in the middle of my cycle so i kinda assumed i wouldnt get pregnant since the chances are very low but i’ve been feeling very nauseous in the morning and ive been experiencing vertigo. I also have mild cramping in my lower stomach area. Could this be pregnancy symptoms or just pms? im afraid it might be too early for me to take a test.. help!!!!! also have been experiencing very frequent painful headaches!!!