I had migraines that lasted for three and four days throughout the second and third trimesters of all my pregnancies, but migraines are a normal part of life for me. I hated taking any sort of medication when pregnant but there were a few occasions when I had to take panadeine forte and have a maxolon shot for nausea.

I agree with PPs though - severe headaches and migraines can also be a sign of things that need to be checked out so best get yourself checked asap.