Please help

I had my period on the 13th-16th oct. Glow stated i was ovulation day was 27th. Had pain on my left side for the last 3 days.

My partner an i BD on my supposed Oday. As we had finished i started bleeding, like literally striaght away.. ( an we werent doing rough an tumble). Its too heavy to be spotting.

I have no idea if its another period or ovulation bleed?.

Im not meant to get my next period till 2nd nov. So confused. Any insight would be great. Thankyou