Someone please respond if you know whats wrong with me...

I am about 2-3 days late for my period. From 9-12dpo I was super constipated. (Apart from other symptoms I experienced) Always pooped but not easy (sorry tmi) anyways, since this morning I have not had a good moment without having to go poop. It's almost like its diarrhea but not watery and its brown but darkk brown. My stomach is killing me with diarrhea cramps and I know I read somewhere that it's a symptom and I will test but once I am about a week late. Until then, what can be wrong.. Only "pregnancy symptoms" I've had or been feeling is starting from 8dpo til now has been frequent urination, tired, taking 4 hr naps (not like me) felt dizzy a couple of times at work, nausea once at work that ended in vomiting. And other times just real quesy. Dry mouth, and breast aren't sore or nipples but they feel fuller. Never experienced half these things with period normally only get migraines and that's it so this month has me feeling like I am in but want to make sure I'm at least a week late with AF. But.. What can the poop mean.. Is this really a sign.. I think it finally calmed down now but before this in the last hour I went 3 times to the bathroom. Please help!