Confused

Kristina

My back aches, my stomach cramps are on my left side and at the bottom of my stomach, 5 days late and feeling a little nauseous. I'm currently ttc with my fiance but I've taken 2 tests in the last 2 days and both came up negative. Also my hormones have been up and down. Like my anxiety is way up there more than usual, i get mad and sad over the silliest things...Any ideas on what it could be?