13 days late & 3 BFN

Skyee

So I'm currently 13 days late for af & ive tested on 3 diff days and all were BFN. Weve been ttc for 6mo now and this month I've been more nauseous, having lower back pain, and been really tired. I'm going to test again when I wake up, but honestly I'm starting to worry something may be wrong with me if this test comes back negative too... ive been pregnant before, but miscarried and all my tests then were negative so I didn't know until I was in the ER.

Any thoughts? Anyone I can talk to about this ?