Confused 🫤

So normally I am a heavy bleeder when it’s time for my cycle to come it never fails with clotting and the whole process of ugh how can I bleed this much and live thing, but September I missed my period and then October 7 I did what I never do and had light pink/brownish spotting, I did this for two days then it went to a bright red and I have only been bleeding when I lay down otherwise it’s not even noticeable throughout the day. I have very small amounts to no clotting and I have slight pain in my left lower side abdomen. Anyone else know what is causing this or good through same with some kind of answer thanks