HIV PEP/PErP Question - Emergency!!!

Hello there to the Medical staff, Sorry for writing in English but i find it easier then typing in Hebrew, I do however fully understand Hebrew so you could simply reply in Hebrew. My question is the following: Last night I was exposed to an HIV risk infection - test positive , I myself sure negative as I tested myself about a week ago - how ironic - any way I rushed to the hospital and the doctor ther gave me a PEP drug. I looked up about PEP and saw many advise on a Combo Drug of as a combo drug like Combivir. what the Doctor gave me is very similar but slightly different. what I was given is Zidovudine 250Mg & Lamivudine 150Mg & Nevirapine 200Mg as a Tri combo pill. please note the the drug was not given to me in Israel as I am on the way to ISR and didn't want to waist time on starting the treatment. the Only Difference between Combivir and the Drug I was subscribed is that the Zidovudine is 250mg rather then 300Mg as Combivir has and my drug has a third Drug in it My question is was the Drug Subscribed to me for the PEP treatment is fine or I should switch immediately to the Zidovudine 300Mg & Lamivudine 150Mg I am a fairly small body weight of about 65-70Kg and in my 30's in age.

Do you know by any chance what is the rate of success assuming I contracted the Virus? Note: I started the PEP treatment about 12 Hours after Expusre