Once you start to dilate is babies head exposed?

I am only 33 weeks and am 2 cm dilated. I still have intercourse and had a cervical exam today so I am afraid of causing an infection with already being dilated. I also have herpes but have not started the antiviral medication because my doctor said they usually wait until 36 weeks. He is out of town so I can’t ask if he wants me to start them sooner. Is the baby still protected by the amniotic fluid or is her head exposed since I am dilated and 60 % effaced?