Depo Shot

So my period is 52 days late, I’ve been on the depo needle for around 9 months now, for 6 of those months I was getting my period on and off.

The last shot I got was the day of my “due” period and it never showed, I had sex probably about a week before I’m allergic to the latex/lube in all condoms I’ve tried everything and they just don’t work for me so my partner and I just don’t use them, hence why I’m on the depo needle.

I tested for pregnancy 23 days after my missed period and it come back negative, the past week I’d say, I’ve been getting little spots of brown/red discharge on and off and was wondering if I should test again? Also last week there was a few days where I was getting white/reddish discharge. Should I test again