Should I be concerned?

My fiancé and I are starting to TTC. I'm going on 26, roughly 250lbs. He is going on 27 and roughly 170lbs. If anything, he might be under weight for his height, and of course I'm considered overweight because of my BMI. According to every dr I've seen in the last 8 years, I am 100% healthy. I'm wondering if I should be prepared for a diffucltyl time TTC? I've been trying to lose weight for years, but all the different BC I've tried as only made it worse. I don't have any health problems, I'm just a little bigger than I used to be. any advice or positive experiences??