Hello Doctor, I Got Bitten By Some Insect While Sleeping

Hello doctor,

I got bitten by some insect while sleeping over left eyelid and near left elbow. Blisters pop out few hours later. I also felt it was spreading near eye. My doctor feels it is mosquito bite but with redness around area, pain even after 3 days and blisters I felt it could be a spider bite.
I informed doctor that I am planning for pregnancy and he gave me Alerid 10 mg and Betnesol forte 10 mg. Is it safe to take these tablets in case I am pregnant? I got my last periods on 25th March.