Doubt..

Hi! My boyfriend and I have been trying to conceive for 2.5 years now, but still nothing. Last week, I was expecting my period, but it came 4 days late. My period lasted 4 days as usual. The day after it ended, there was no more sign of my period. But the next day, after urinating, I noticed some brownish mucus coming from my vagina. I experienced this twice that day. The following day, I had it again, but only once.

Lately, I've been having more and more back pain, and suddenly I've been getting stomach pain every day (which I never normally have). Lately, I've been feeling sensitive, and my mood has been all over the place...

I don't know if I should think this means I'm pregnant or not... Help..