Feeling so yucky but got my period...

I got my period right on time, but I've been feeling yucky for so long.  This month especially...things make me feel nauseous that didn't before, I'm worn out, need to nap almost daily, headaches often...I felt like this with my 2nd pregnancy but this time I have a period with it.  I'm pretty sure I'm not pregnant, as my period is very normal, but I keep finding posts about ppl that kept a normal period  throughout part of their pregnancy.