Help please! (A little TMI) but I need advice!

Heather
So I was supposed to get my period yesterday (they're pretty on point every month between 28-30days) I've felt pregnant for the last week or so ESP my breasts (more so nipples) are extremely sore and I mean incredibly sore, not like the normal discomfort before period and its been happening for a week and a half. I get waves of neasea every day along with a couple other symptoms but my body does feel off. We are TTC so I was praying I wouldn't get aunt flow. On day of expected period, what it indicated on here, I started getting light brown discharge, now I'm on day two with darker brown light discharge on my tampon with slight pink blood but very little and no cramping or anything? I don't know what to think? I generally have a very heavy flow by day 2 of period with the whole 9 yards of cramping ect but this I've never had. Has anybody else had this? If so please let me know your outcome... I'm stressing out!