Scared (spotting)

Hey everyone,

I'm a little scared at the moment. I have PCOS and have been injecting hormones to get an ovulation. That worked out fine. If everything is alright I should be 3 weeks and 2 days. I have a lot of symptoms. Especially the painful boobs and exhaustion are present. Only today I had some brown spotting. I'm scared because that's how my period always start...

I couldn't take a test till today because it would give a false negative because of the injections.

Could it be spotting?