early labor signs?

Ciara
Hi ladies! I'm 36weeks & lately I've just been feeling off.. This last whole week I've had a non stop migraine, which I've had to take Tylenol PM to even go to sleep at night because it's so bad. In the past few days I've experienced a few "pre labor" symptoms..
My stomach gets extremely tight (not hurting, just feels like I have rock hard abs)
I've been having migraines.
Nauseous.
Diarrhea.. (Went three times today, still feel like I got to go)
Extreme discharge, I had normal discharge up until about 3 days ago.
& I also feel my daughter touching my cervix as if she's trying to come out.
Also, I do have a streak of high blood pressure and protein in my urine.. So I've been trying to be very careful.
I haven't called my doctor yet, but I do have my 36 week appt Wednesday which I plan to tell my OB everything that's going on. 
Just need some advice, what do you think it is? Is my body just prepping for labor? Or do you think she'll be coming really soon?

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