Palmer's tummy er rash?

i am 30 weeks pregnant and about a week ago i began using Palmer's tummy er because i spotted a stretch mark. then yesterday, i looked at my stomach and i have a rash! i called my dr and she said it is probably from the cream i am using. so i googled it and i found a lot of other women complaining about the same thing! my dr said to take benedryl and call if it spreads or gets worse. has anyone went through the same thing with this product?