Wow, 1st trimester? Thats not fun! I ate lots of Tums and I think that may have assisted in my getting light Amenia. If it really bothers you and Tums aren't helping, talk to your doctor about a prescription. He gave me a one a day Prilosec prescription and I never had any problems after that. But my daughter had LOTS of hair so maybe you can at least look forward to that. :-)
My doctor tells me I can have tums, etc. He also suggested something over the counter like Tagamet or Prilosec. Im just now in my second trimester. I guzzle Mylanta at least three times a day!! Good luck mama!