Hello! Me And My Boyfriend Contact Aug. 19, That Day

Hello! Me and my boyfriend contact Aug. 19, that day is my ovulation. 1week after, Aug. 26, i took PT--negative, a week after 26 again, PT is Negative. I missed my period Aug. 6, i took PT at 12am, idk if its neg or pos. with faint line same on Aug. 7, i took PT in the morning, its positive i think cos there is a very light line on T. I went to the clinic to have BLOOD TEST. I dont feel any symptoms only back ache (maybe bec i am working too much in the office) and i slept 12hrs once.
So the result is NEGATIVE. Aug. 8 today and still dont have period. Am i pregnant or not? What will i take? I have Primolut-Nor here and i take 1 tab in the morning .