Hi I had sex then beginning of August and I was supposed to start my period in the beginning of the month but it didn't come until the third week like toward the end and then my period start of not as heavy as usual and now it's day 3 or 4 and I had bad cramping but I thought I was pregnant but my breast doesn't feel sore and I do feel nausea and headaches and then today j had some watermelon and it make me kinda nauseous and burp and then it went away I don't know what's going on can someone help me