Irregular periods on BC

Norma
Does anyone else have problems with their periods while on the pill?? I used to be very regular, AF would come on time every time like clock work and last five days, medium flow. But ever since I've been on the pill sometimes I skip a month and a half and my periods are weird. Super light and only last like 2 days sometimes 3 it's just so weird for me. Any thoughts or advice?