Worried about getting gestational diabetes…

What have people's experiences been. I'm terrified....halllp...lol. I've been borderline for like 5 years and doc keeps saying watch my weight but I have PCOS and it's really hard. I think I have a strong body. I was going to Orange Theory off and on for like the last year and even tho I'm bigger I can run several miles in a half hour period. Starting weight is 237lb...and have already gained 5... oh gawwwd...I'm 5 weeks and one day...conceived using donor sperm and IVF....ecstatic but kinda anxious about everything lately....and balling even when I'm watching Ellen for goodness sake.