About a week ago, I got my first cold sore. I treated with abreva an valtrex (valacyclovir). Now it's nearly healed but some blisters didn't pop. Still infectious?

Herpes. Unfortunately you may be misinformed. If you have herpes you could be contagious all the time, even when you do not have a sore. The viral shedding through your skin is unpredictable and has no relation to whether you have a lesion or not.