I Was On A Progesterone Only Pill (desogestrol) For 2

i was on a progesterone only pill (desogestrol) for 2 months, had no problem for the first month and a half but then had constant bleeding for about 3weeks so i stopped and took a day off and then went to the pharmacy and got zoely instead because i was on it about 2 years ago for a few months and had no problems, and took that pill after the one day break from the POP, after 2 weeks i had some bleeding but its not like a proper period, more like very light and the sort you get on the last day of a normal period I've had it for 5 days now and i was just wondering what it is and if its likely it will be constant like the effect of the POP. I'm also not sure if its even considered a period or breakthrough bleeding? because the pop completely messed my cycle i don't know what date I'm supposed to have a normal period. so should i stop the zoely pill or wait and see