Has anyone successfully became pregnant…

Has anyone had success getting pregnant by quitting pop or caffeine beverages and loosing some weight?

I am currently 203 lbs and 5’7 this is the heaviest and out of shape I have ever been. When I use to exercise and be in shape I got my period like clock work and ever since my weight gain over 80 lbs I’ve had a hard time with irregular cycles making it nearly impossible for me to pin point my ovulation. Any advice would be greatly appreciated and please keep it nice I am generally asking if working out more and this may help my cycles become regular again.