Very irregular periods.

This is going on my third week of my period. A few years ago before I started birth control, my periods would last a month and then a week off and then a month back on over and over for about a year. Long and heavy and huge clots!! They started being more regular, so I have since stopped taking birth control so I could try to get pregnant. I just don't want it to go back to the way it was. I want a baby!