I agree to go to like a medexpress or urgent care. This happened to me several times with my first pregnancy and my doctor told me it's something that I should call about and be seen right away. It could be a problem with blood pressure, blood sugar or a sign of something else. That said, with me it was a problem with blood sugar levels. Drinking lots of water, eating steadily all day with plenty of healthy calories, and not overdoing my activity mostly resolved it.