hi , im 20 years old and ihave fairly normal periods i had unprotected sex on may 24 my last period was may 14. i missed my period in june with only light spoting on june 27th that lasted maybe 2 hours. i have now missed a second period but i took two pregnancy tests around june 20 and they were both neg. i have consistant headaches , dull pain in lower back and side, heartburn and just feel all around different could i still be pregnant.