Alot of women have to take blood pressure meds while pregnant, the key is to be monitored close while on them. I am on Atenolol 10mg which is a beta blocker and so far all is well. You should see a maternal, fetal medicine specialist, and make sure your cardio output and gestational age match, just call your OB!
I would definately speak to your doctor....this is what I just googled and found....
DRUG INTERACTIONS: In general, lisinopril should not be taken with potassium supplements or diuretics that conserve potassium [for example, hydrochlorothiazide/triamterene (Dyazide)], since blood potassium levels may rise to dangerous levels.
PREGNANCY: Lisinopril should not be taken during pregnancy because fetuses and neonates have died when lisinopril was administered during pregnancy.
NURSING MOTHERS: It is not known whether lisinopril is excreted in breast milk.
SIDE EFFECTS: First doses of lisinopril can cause dizziness due to a drop in blood pressure. Lisinopril can cause nausea, headaches, anxiety, insomnia, drowsiness, nasal congestion and sexual dysfunction. Lisinopril should be stopped if there are symptoms or signs of an allergic reaction including feelings of swelling of the face, lips, tongue or throat. Severe allergic reactions (anaphylaxis) and hives occasionally occur. Rarely, lisinopril may cause a drop in red blood cells, white blood cells, and platelets.
Lisinopril can impair the function of the kidneys, and every person taking this medication should have their kidney function checked.