Are you taking liquid or tablets?? Sometimes the liquid aggravates the heartburn a bit by the swallowing action (so my doc said!!) and I find the tablets much better and more soothing.

Quickeze have no aluminium in them. Healthfirst here actually say no mylanta for preggies, but depends on how much and for how long. If you are using a couple of times a day, every day - try an alternative such as gaviscon or quickeze.

Good luck!!