If you feel dizzy and weak in the seventh month of pregnancy, you should check your blood pressure and blood sugar. If the blood pressure is high, you should take antihypertensive medication in a timely manner. During pregnancy, you can take nifedipine or labetalol, which can lower the blood pressure and will not affect the health of the fetus. If you have high blood sugar, you will also experience weakness and dizziness, so you need to pay attention to diet control, do not overeat, do not eat food with high sugar content, and if your blood sugar is too high, you can also be treated with subcutaneous insulin injections. If your blood pressure and blood sugar are normal but you are dizzy and weak, consider whether you have a cold or an upper respiratory tract infection.