Need advice ladies please!!!!!

😻Bella😼 • TTC baby #1 please send baby dust me way:0)
So I was suppose to get my period on the 3rd of this month, I'm now 6 days late, my breast are super sore, I'm very fatigue (Slept pretty much all day yesterday) but I have insomnia and fibromyalgia and at times that wipes me out, so who knows what's causing that! Anyways I took a pregnancy test first thing in the morning and it came out "Not pregnant" I'm so confused and don't know if it's still too early which I didn't think it was. I so need some advice and when should I take another test? My 6 month follow up with my OB/GYN doctor is in 2 weeks. Maybe I should wait til then???? It's so hard to go so long without knowing what the hec is going on!!!! What should I do???