I have them but I am not pregnant. Here is what I try (minus the medication which can't be taken in pregnancy). Take anti acid tablets - works for me. Take all my clothes off and lie on the very cold bathroom floor. I get very hot when having panic attacks and this physically hurts but the shock seems to improve/stop it. Imagine you are in a safe place that you feel comfortable, describe what your can see, hear, smell ect. Breathe into a paper bag. Breath, 2, 3, 4 and out 2, 3, 4. If you are really bad get somebody else to count for you until you can count it in your head. Don't let yourself think about what if or think about how to stop them. Remember nobody dies from panic attacks and the usually last a max of 20 mins.