Brown?

Hello!

I know it’s probably normal but it got the injection in December and I’m due one in 25th if Feb. I had a period around 3weeks ago that lasted just over two weeks( I know it can mess up) I had a break for a week and a bit and I started again but it’s just brown blood? I had sex the night before but it’s been around 4days now and it hasn’t changed to normal colour as I know brown blood it old blood but i just thought it might of stopped or even gone to the original colour sorry for tmi!

Anyone had the same?

Thank you