Migraine & pregnancy

Hi,
I am 30yrs old and having migraine headaches since age 14. In the beginning my migraines went away after a few hours of sleep and very little medication but gradually they became more violent and difficult to handle. Now I have to take Maxalt 10mg if I feel a migraine coming (approximately 1x/week) otherwise I have a full blown 3day crisis (24/24 sleeping, not supporting any noise or light and not being able to eat/drink, because of constant vomitting)... My preventive medication (80mg propranolol) doesn't offer a lot of relief but I keep on taking them because maybe I would be worse off without them?

I am now at a stage in my life where many friends are having kids so that makes me think a lot about... pregnancy and how to handle my migraines at that moment! I heard that there generally is an improvement in 2nd and 3rd trimester but what about 1st trimester?? It really feels impossible to me not being able to take my meds (especially Maxalt) during a few months! My employer definitely will not appreciate having a person calling in sick every week or so... And I don't think I will be able to handle a migraine crisis myself on a regular basis...

I would like to hear from women finding themselves in the same situation and those who already had a baby! How did you get through those first couple of months? Many thanks in advance for your reply!

Katie