Missed period but not feeling pregnant

This is the second day of my period but it hasnt came yet and i did have sex a week before my last period came and then had sex again after my Period. I have been pregnant before and i already knew from the start i was pregnant before i missed my period for my first pregnancy i had sore/tender breast, nausea, i had very low blood pressure, my areolas darkened, mood swings here and there, cramping and a missed period. But now im not getting any symptoms at all but a two day missed period. Has this happened to you? Could i be pregnant again? Should i try a hpt? And my periods are not irregular.