Should I go to ER?

32 weeks and 4 days today--for the last week or so ive had severe migraines on and off, but ive had no problems with my bp so far. in the last two days, my discharge has been a lot more watery and frequent, ive had horrible lower back ache, and abdominal cramping.. its 3 am where i live now and all of this is keeping me awake, bc im so uncomfortable, even after taking tylenol pm. i have a dr appt tomorrow morning, but its not with my normal OB so i doubt he will actually tell me anything.. should i wait for the dr appt or just go get checked today?