Period, but still having pms/pregnancy symptoms.

TMI!!

I have an average 28 day cycle, but could be as long as 35days once in a while. I started on day 35, so a longer cycle. Basically a normal period with cramps, and the works. Only weird thing was I usually am heavy on day 1 and 2, but was heavy on day 3, the rest of the time didnt even fill tampon.

Thought period was over just brown spotting on and off until my DH and I BD then I had bright red spotting that lasted till the next morning, then nothing. Since then I have been having light cramping on/off, breast pain, mood swings, gas, diarrhea, fatigue, and back ache. All the things I get right before my period. I dont know what to think.

Could I be pregnant? Weird hormone thing??

I took an opk and it was negative so it's not early ovulation. I'm on CD9.