Recent weight loss and now pregnant

I have some loose skin since losing 56 lbs over the last year. I just found out a week ago I’m pregnant. I’m currently 5 weeks exactly (tomorrow) & just wondering if I should expect really bad stretch marks or if the loose skin I have from previously weighing so much should prevent them? I already have some stretch marks from being heavy before. I plan on working on a nutritional and workout plan with my doctor so I can lose more while pregnant (currently 204 but would like to get below 200). Not sure if anyone else has experience with this.