Mummy with severe allergy - hives

I have been having allergies even before pregnant and can only be controlled with medication as cream doesn’t help. Usually take zyrtec which has cetirizine dihydrochloride. During pregnancy I tried not to take any medication but the allergy is so bad that it spreads to the whole body including face even without me scratching it and I have sleepless nights due to this. To sleep peacefully I have no choice but to take the medication which I have also consulted gynae Which they said it’s fine to take. But was wondering will there be any complication if taken on daily basis since the allergy will flare up mostly on daily basis and won’t go away until medication is taken? Worry that it will affect baby and I’m only in my 2nd trimester & still have months to go..