I got Menieres Disease in my first pregnancy & the severe vertigo returned this time. It's under control now. Blood pressure changes can lead to short spells. So be careful getting up & down. Blood sugar fluctuations can lead to longer spells, so eat regularly & focus on food that releases sugars slowly. Ongoing spells can be caused by a lot of things. For me, fluid retention affects my inner ear and sets of the vertigo attacks that can last 3+hrs. I now go to physiotherapist to loosen my jaw bone so fluid runs freely again. It helps. If you vertigo goes together with tinnitus and/or hearing loss the issue will be inner ear related. It might just be an inner ear infection, which sometimes is asymptomatic (no pain).
Always have a plan ready in case you get too dizzy. Can you reach someone to come out to you? It gives peace of mind & you don't have to be too housebound.