On march7th I had my period. It was normal. On march 17 and 18 I had un protected sex. On April 7th I started having a dark brown stuff coming out but it was exactly like my period, such as the amount. And, 2 days later I woke up bleeding really bad and hurting really really really bad. Then after that whole day all I had was the brown stuff again. Then after that the next day I had a little bit of blood when I went to the bathroom and then from after that the brown stuff until the thirteenth. And the thirteenth it completely stopped in the middle of the day. Could this be implantation bleeding? Please serious answers only. Never been on birth control. When should I take a HPT. Just give me info. Please.