Menstrual cycle after colonoscopy?

I had a colonoscopy done back on the 14th and it seemed like everything went fine. They removed some biopsies as well. All were benign (I waited for my results before posting). When I woke up I had some pain in my back, asked about it, and I was told it was common.

On the 17th I started bleeding from my vagina, which seemed like spotting at first, then lead to heavy period, longer than my normal period and much heavier. The colour and pain were pretty consistent with my normal periods but I also seemed to have intense back pain. Was crying a lot and could hardly get out of bed sometimes.

Normally my menstrual cycle is really long one month and then the next two are regular or just a few days shorter. However the prior period was just 18 days long and, as said before, this period started only a few days after my colonoscopy.

I’m mostly wondering if anyone else experienced something similar. I’ve scored the web, as much as my goldfish attention span would allow, and only found period during, before, or they had a vaginal exam done as well. If there’s any insight to this that would be great. I’ve messaged the doctor but have gotten a response back.