I'm after general advice and reassurance please 
I had my daughter 6 months ago and I have not yet had a period. For background info, my periods have never been very regular. I discovered I was pregnant in Feb 2020. At that point I hadn't had a period since Nov 2019! I also have had excessive facial hair growth for the last 6 years although ultrasounds show! no sign of cysts on my ovaries.
I breastfed for the first two days following her birth and then she started formula feeds.
Around the end of March I started to have brown discharge which was quite stringy so I thought it may be my period. It didn't fill a panty liner and lasted for 5 days and was accompanied by lower back ache and cramps.
Now for the last 5 days I have been having stringy discharge when wiping which is a pinky brown colour, the tissue paper is pink when wiping and this morning there's red streaks when wiping. Again with back ache and cramps. Past two smears (last one in Feb 2021) have shown HPV but no abnormal cells. I have also taken two pregnancy tests which are both negative. I've been referred for an ultrasound and have had bloods taken (no results yet).
Going out of my mind with worry that it's something sinister. Anyone else experienced this?