Stretch marks already?!

I was pretty large before getting pregnant. About 235-240 pounds. I'm only 5 weeks pregnant and just seem too big for how pregnant I am. I haven't been eating any differently but I'm already bloated and look more pregnant than I am. I knew stretch marks would come but this seems ridiculously early. I saw one last night and broke down crying. If it's happening this early it's going to be really bad :/ I'm just having a hard time coping and wanted to put this out there.