Ulcer medication and pregnancy?

Im 21 weeks pregnant, and 20 years old and I have an ulcer as well, after a few years of taking prescription meds I decided to try something all natural called probiotics. they worked, but regarding taking them during pregnancy, I called the advice nurse and she told me that its really not a good idea to take anything in the beginning of pregnancy until you get the ok from your doctor. some of the few meds pregnant women can take are just benadryl, tylenol, and vicodin if necessary. I'd talk to your dr. right away and then get the ok to take something all natural because there are too many unknown substances in pills now that could contribute to birth defects.