plan b and sex

I had unprotected sex and I took a plan b 5 hours later I'm 15 I first started my period at 14 beggining of freshman year but I'm turning 16 so my. Period was regular but also irregular. After taking the plan b a week later I had sex on a Friday and right after I had brown discharge but dark then Saturday I had blood like period blood I thought I got my period then Sunday I had light brown tan discharge as if I got off my period and all week that week and this week I've had cramps and lower pain in my uterus and on my sides and I look bloated when I move it feels like liquid or empty on my lower stomach am I pregnant???? I'm supposed to get my period in 5 days!! Help