NEED SERIOUS HELP!!!

I need some help! I am currently on cd28 of a 32 day cycle. AF due on 2/28. I went to the bathroom this evening, and when I wiped, there was brown streaked cm. Upon return trips to the bathroom.... Nothing. My cervical position is low and very soft and spongy,and closed, which is abnormal for me right before AF. I've also been nauseous and gagging all day, and my breasts are super sore! I can barely wear my bra, and my nipples can barely rub against anything.and I've been peeling all day (sorry for all the tmi). Am I reading too much into this, or could this be it?! Could it be my BFP, or just PMS?