I had sex July 1st my fertile period began the 2nd through the 5th. My breast started hurting really bad three days after. I felt nauseated, tired, lower back hurting, headachs and frequent urination. My breast normally start hurting a week before my period is suppose to come on but it stopped hurting a week before my period was suppose to come on. I vomited 3 days before my period came on and I took an early pregnancy test and it was negative. My period came on the 19th of July and it lasted until the 22nd and know am having very light pinkish brownish spotting 3 days after my period went off. I am still feeling nasueated and I still feel tired. Could I be pregnant?