AF late, pregnancy sympyoms but BFN every test. Whats going on?!

So my boyfriend and I are trying to have a little boy. we have been BDing regularly and we are hoping I'm pregnant. AF is 3 days late but all I'm getting is BFNs. I have been exhausted and sleeping a lot, cramping and pain in my lower back, peeing frequently, having clear discharge every other day it seems and recently started having headaches. I'm also a mother of 5 girls and from experience, I feel pregnant. I got my Mirena removed on June 28th and I have hypothyroidism. I just want a BFP already. anyone else having these issues? Baby Dust to all!

Update: I took another test this morning with my 1st pee ... BFN. Period is a 5 days late now. 😔