My period is usually for 8 days then I’m off I almost completely missed my period. I took a digital last night and it was negative I’ve been cramping and keep running to the bathroom due to me thinking AF is starting and it’s not. I have been extremely bloated,cramping a lot on and off,pimples, last night had a extreme lower back pain when I got out which is very unusual. But PMS SYMPTOMS CAN CHANGE! I am turning 21 Wednesday so I just wanna make sure I actually am not pregnant and it’s just my period being dumb should I get blood work done???