i last had intercourse with condom on 28 July and i had period for 3 days starting on 1st August but it was little each time. Then on 18-21 August i start having dark coloured blood coming out. Again, they were little each time. Until now my usual period still have not come. During the month, i had some family problems and little rest. I took a urine test on 2 Sept and it came out negative. Is this due to hormones or am i pregnant ?