Headaches late in pregnancy

M.

Has anyone else had bad headaches in the third tri? I used to get them in the first and they would always respond to meds, but I've had a headache for the last three days now and I've tried everything but it won't go away. I called my doctor yesterday but she hasn't called back. Is it normal to have these kinds of headaches this late in pregnancy? I am 31 weeks tomorrow.