Talk to Gynecologist on Hyperprolactinemia

I want to know which level of prolactin can interfere with periods? Last year in april i was 5,6weeks pregnant i had a d&C , i had mild elevation in prolactin level 29. I took brotin for 3 week n stopped using it bcz of the side effects constant nausea but i was having my periods .after few months i started taking taking yaz ,i took it for 7,8months, stopped it on 24th march ..i had withdrawal bleeding after few days ,and than for one day after first withdrawal bleeding .. after 3 weeks i didnt had my regular periods (due to hormonal imbalance obviously ,)i did some tests,prolactin,bchg,tsh,testorterone cbc , ultrasound i dnt hv pcod.everything was fine apart from prolactin it was 47.87.what can be the reasons of prolactin..? Than i was suggested to start brotin and primolut n to induce periods On the 5th day of primolut i i was nauseous, after2 hrs of first dose of 5th day i vomited, after 40-50mins of 2nd dose i vomited so bcz of this interruption i continued primolut n for