Ttc with a psycho period?

So my period is absolutely insane. Its never been regular but lately its been outrageous; I went on the pill in 2016 bc my period didnt come for 2 months, then came on for 14 days. After i went off bc in july 2018 my period was on for a 3 says in july but didnt come on in august, September or October. In November my period was on the ENTIRE month. Now im on birth control again. It seems like the only time my period stops is when i take birth control; but My fiance and i want to start trying for a baby starting in July but im so scared that my period will stay on for months at a time once i stop my bc😫😫