Hi, My last intercourse was on 03/03/2015 ( during

Patient: Hi, My last intercourse was on 03/03/2015 ( during fertiles days and ovulation day ), my period after that showed up a week before very heavy . I took 4 pregnancy test, all negative, .my periods are usually never late, but right now i was supposed to have my period 4 days ago but still nothing. My breadt kind of hurt and i feel sick and tired. I took another pregnancy test 2 days ago, still negative . Could i be pregnant?

Doctor: