First of all, Congratulations on your little one! I hope that your pregnancy goes well. Wow, a bp of 70/40 isn't good, and neither is being dizzy and vomiting. I hope that you and your doctors will be able to find the right treatment for you and your baby during pregnancy. Here is my experience with my last pregnancy. I took midodrine through the whole 9 months. I took 15mg 3-4 times a day, and delivered a 10lb baby at not quite 39 weeks! No growth retardation there! I did discuss midodrine with my OB and a high risk OB, and they both agreed that it would be best for me and the baby if I took it throughout pregnancy. Part of the concern was for proper bp and blood flow. I have significant blood pooling, and there are times that there has literally been a line around my waist, above which was normal skin color, and below which was blueish/purple. The concern was that without the midodrine I would have too much blood pooling, thus preventing adequate blood flow and oxygen to the baby. It is true that midodrine has been shown to cause growth retardation. However, this has only been shown in rat and rabbit studies when the medication was given in 7-13 times the maximum dose. Plus, the rats and rabbits didn't need the medication in the first place. I think it must be different for someone who needs their blood pressure to be raised. From what I understand, midodrine has never been reported to have caused low birth weight in a human baby when the mom took the med during pregnancy. Just to be safe, my OB ordered ultrasounds every month to check the growth of the baby. For the last 6 or 8 weeks I had ultrasounds every other week. I also wore compression throughout pregnancy. This could be an option if you choose to be off of midodrine. I work knee high compression hose and mid-thigh to waist compression. I wasn't sure if I would be able to wear them even to the end of pregnancy, but it worked out just fine. The waist of the compression slowly stretched with me, and it fit well even when I was 9 months pregnant. I hope that everything goes well for you. Some women with dysautonomia feel better during the 2nd and 3rd trimester because of the increase in blood volume. Hopefully it will help you too! All the best, Rachel