Switched COCs, now on mid 3rd pack. Normal to still be spotting til now (starts midcycle usually)? Pills always on time, taking no other medication.

Breakthrough bleed. Breakthrough bleeding (bleeding at the wrong time) is very normal on birth control. It happens in about 1/3 of users. Its no big deal and usually self corrects over time. If you are not satisfied or it continues to happen then consider using a different birth control method. It is a common side effect and does not mean something is wrong or that the pill is not working.