20 days late af, looking for anyone that's been through the same 😭

the first day of my last af was 9th December...5 day period... I'm regular 30 32 days... af should have come 10th January... currently 19/20 days late period... thought it started Tuesday last week and put a tampon in but I just ended up with 4 days of brown discharge when I wiped... we are trying but I haven't kept track of my ovulation... I had cramps when af should have come... but I feel good no symptoms at all... i have taken about 20! pregnancy tests which have all been negative 😭😭 any advice would be appreciated!! ps anonymous in case someone sees me as i would love this part of life to be wonderful surprise ❤