I had very mild herpes zoster just 8 blisters and i am cured now my pregnancy test is positive now after 5 days of medicine .can it affect the fetus ?

Zoster: It should not affect the fetus. It is a reactivation of the virus that you have had since chicken pox (or the vaccine) in your youth. With shingles (zoster), the virus does not travel through the blood stream - it travels locally down a nerve and to the skin. If anything it will boost your immunity to shingles/chicken pox during pregnancy.