Desperate for advice - wheres my period at

So before I begin - I have had 2 children before, I do not take any contraceptive birth control, my cycle is usually around 36 days which is completely normal for me.

I’ve missed my period by a good few weeks! I tested a week ago and it came back not pregnant so I just thought as I’ve moved home recently I might be a little stressed and I’m deffo under the weather too.

I’m now on cycle day 56, and am experiencing the smallest amount of bleeding, mostly only notice after a pre when I wipe. It’s very light pink but the majority is brown which I know is old blood. I also don’t have cramping in the usual manner but am have a very sore back and belly.

Just wondered if I’m over thinking it, it’s all very odd! If anyone else has experienced this or has a clue about women’s health then I’d love to hear from you.