Weird feelings/Work

My body is feeling totally off, I've been cramping, I've had some weird colored discharge and I just don't feel right, when I stand I get super sick when I stand up and it feels like there's a tight feeling in my abdominal area if I stand for to long...  I've never done this pregnancy stuff before and want to get my OBG's opinion and I'm suppose to work an 8 hour shift but don't feel comfortable doing so with these weird feelings. I'm afraid to call off on one hand but on the other I feel I need to do what's best for baby and myself.. Anyone else had this issue? Replys are very welcomed..