24 days late on period and negative tests

My last period was 8/21 and lasted five days... period is usually 31-34 day cycle but around 9/10-9/11 i had suuuper light bleeding only when i wiped. It’s now 10/16 and still no period... I’ve take a million hpt tests and all have been negative. I’ve done one hpt blood test about two weeks ago also negative and am gonna go get a ultrasound at the end of the week to make sure i don’t have cysts on my ovaries :( SO and i have been trying for four months for a baby so this is all frustrating... anyone else been through this?