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The fibroid you have is a big one, but it is not caused by pregnancy, and it can be taken out after your baby is born by an operation called myomectomy. Uterus removal is not required. It can happen right from the beginning. Take one capsule of Polybion (Vitamin B complex, Vitamin C, Folic acid, and Biotin) for low blood pressure once a day. As your hemoglobin is low, you have weakness. You should start Dexorange (Ferric Ammonium Citrate, Vitamin B12, Folic Acid, and Zinc Sulphate Monohydrate) capsule once a day for a month after two months of pregnancy, or if you do not have nausea, you can start now. For gastric issues, you can take tablet Doxinate (Doxylamine and Vitamin B6) twice a day and Syrup Digene (Magnesium Hydroxide) two teaspoons thrice a day.
Consult your doctor, talk to them, and then take the medications.