I woke up this morning with a clear blister on my lip that i didn't have last night. i am 14 weeks pregnant, so not sure how i got it. maybe a fever? any idea what it could be from? and what i should do for it?

HSV 1: Blister on the lip suggests previous exposure to the herpes virus that manifests itself for the first time, it seems. Pregnancy is a state of altered immunology, which could have contributed to the herpes flare up. It may be a good idea to do a blood test for HSV 1 and HSV 2. HSV 1 used to cause cold sores (labial herpes) HSV 2 genital herpes,