I was supposed to start my period on May 17th. I didn't end up starting until May 27th. The first day was light blood, the second day was a normal flow of blood for me but the third day which is today is just light and spotting. I've had early pregnancy symptoms like headaches, cramping, back cramping, and tiredness. I haven't been nauseous at all but my nose is very sensitive to smell. My stomach feels very heavy and looks as if its shaping but it's not hard. I took 3 at home pregnancy test and they have all come back negative. What should I do now?