What is going on????

[Davis1016]

My last af was March 6th. I have no idea when I ovulated so I suppose I could have just ovulated crazy late. My cycles are usually 28 days.. 30 at max. So I'm on cycle day 39 now. I did have this weird brown spotting yesterday but it was never even on my liner. Only when I wiped a couple of times and it's gone now. No af symptoms.. I'm usually in a ton of pain and have crazy heavy flow! I've taken a couple of pregnancy tests throughout the last couple of weeks. All bfn. Should I just keep waiting? Has anyone had this happen??