Need some help,

I have not had a period in 79 days, I started spotting about 2.5 weeks ago, but only spotted for maybe a few hours (lightish pink) Then yesterday I started spotting again, again for only a few hours (tmi) but didn't even feel a pad... It was very very dark like brown? Color... I do have unprotected sex due to wanting a baby. Have taken about 4 tests and all come back neg. doc app isn't for awhile so I'm curious of ideas of what could be happening? My last period was on Jan 11th.. The period before that was 94 days late,