2 or 4 tabs of misoprostol? Abortion?

I took 3 pregnancy test on 3 consecutive days after missing my period. One came negative and other two had a very faint line. I took another and that had a faint but visible line(darker than rest). I consulted a gynecologist and she told me I was pregnant. So she gave me MTP pills( mifepristone and misoprostol). But I was in a little confusion so I took a beta Hgc blood test before taking the first pill mifepristone. Now after I took the mifepristone pill, the results of beta hgc came back 0.15 which is negative. So I consulted her again and she told me as you haven't got your period and you have already taken the mifepristone, continue the regime but now instead of 4 tablets take 2 tablets of misoprostol only. (As I am not pregnant) So will just 2 be enough? Is there any chance of Rpoc or incomplete abortion?