TTC but need help

Okay, so below is a photo of last months period for me. This month I was supposed to start on the 13th according to the glow app. It's the 16th and still no period. Monday 13th I took a pregnancy test and it was negative. My lower back hurts and my nipples are sore to even touch but normal color. & my moods are out of whack. I dont have a female figure to talk to about this stuff what do I do? Please help.