Irregular/ Absent periods. Get pregnant.

I got married on 2016 and I have no child yet. Before marriage I had regular periods but after marriage from 2017 my menstrual cycle completely changed where I get periods on January February then missing for five months then it's normal till next year. This happens for the past three years. This year also I got my period on January then it's completely absent till now. Due to lockdown I consulted online doctor they prescribed me crina ncr 15 mg. Earlier I have taken meprate 10mg and day 28 tab. Is it safe to take crina 15 mg or else I should go with meprate 10 mg or day 28 tabs. Before marriage i was 48 kgs but now I am 65kgs. I have migraine issues from past 8 yrs. Kindly suggest me medications and food habits to follow to solve this issue and get pregnant.