I have a bmi of 27 which is in the overweight category . Three times I've conceived in the first or second month but first time it took 6 (when my bmi was about 25). I've had three losses unrelated to my weight.
The very best thing you can do is try to bring your bmi down for your general health and with ttc.
Sorry to point this out but bmi of 33 is actually obese rather than overweight.