Sorry to hear you have covid and bleeding OP. All 3 of my MC's started as brown spotting, then pink, red and heavier etc. There are also LOADS of posts on here with success stories, where people had bleeding and had a successful pregnancy, so it could go either way.
I was pregnant via IVF in May 2020 (I declined the invite to Boris's party/work function!). I started spotting and contacted 2 EPUS- but neither would see me. Both said that in 'normal, pre-covid' times, they would have, but in lockdown they couldn't! Its certainly worth contacting your local EPU, but I don't know what the rules are currently, and if they have eased their rules, but unlikely if you are covid +ve?
Apologies if this is TMI. If this is your 3rd MC, they might allow the products to be tested genetically (if you do actually MC). I don't know if they will, as you have children, but its something to ask. I used a sterile specimen container from a pharmacy and collected the products and kept in the fridge till I got to the EPU. Strangely, the EPU allowed me to go inside the EPU, wait 1hr in the waiting room and a consult with the nurse to hand over the products- but wouldn't do a scan! I was still passing heavy clots at that stage. I do realise nothing would have stopped the MC, but just seemed bonkers at the time.
If they wont allow genetic testing, they may do regular, histology testing if you do MC and can take the products there. With my 2nd MC, they wouldn't do any genetics, but did do tests. I found out that there was indeed a foetus and it wasn't a blighted ovum. Also, that it wasn't a molar pregnancy. I still MC'd, but having a report and some confirmation, was actually quite reassuring and closure for me.
Apologies this is so long, and I do hope its not TMI. Its info I wished I'd known with my 1st loss. Its early days though op and as I said, could go either way. 