Should I be worried?

Im on the pill, cerelle, and in September I started bleeding and it lasted for 4 weeks, then on the 5th of November I had brown spotting, and then on the 9th of November i noticed I more brown/pink spotting on the tissue and over the last couple of days there’s just more and more blood but still only on the tissue I don’t need a pad or anything. I’ve been on the pill before I had my second daughter and I never experienced any bleeding at all. I’ve taken the pill every night around the same time. I’m a bit worried it could be something else but I’m only 21 so too young for a smear test (I’m in the uk). Any advice?