I was one birth control since march of this year, since then I've only had sex once which was may 29th and I was taking my placebo pills that week and we used a condom . And on June 8th I went to the doctors for high blood pressure so they took me off my birth control to see if that's what causing my blood pressure to be high. And since then I started my period yesterday, is it possible for me to start my period that fast after not taking my birth control for 4 days? I've had really bad cramps and my pad would be dark red. So is this a normal period or implantion bleeding? And how long does implantation bleeding last? I just want to know if I'm okay since I've been taking my birth control religiously and we used a condom. And my last period was may 20-26