Irregular periods. Any medication?

I took Diane 35 for 3 months from March -May , then I stopped it. This time , my periods came after 36 day , and it's very light on the first day. The same was happening when I used to take this pill, on the first day , my periods were light( spotting) , then they got heavy for a day or two and then light. Is it normal after stopping the pill or it's the side-effects of that pill? Before starting this pill, I had my periods after 33-35 days. My average cycle is 36 days on Maya app. Sometimes it gets late by 43 days also. This time, they came after 36 days , but only spotting is there. Everytime, I take a medicine , they come on time , otherwise they get late by 35-37 days , and sometimes 39 also. Should I consult doctor ?.. or wait for my periods to regulate without any medication?