hello

my last period was feb 20th 2011 and on march 22nd 2011 i took 2 home pregnancy test one in the morning a one in the after noon they were both positive. so i went to the doctor to have him confirm the pregnancy and hid pregnancy test was a VERY VERY faint positive so he got a blood test done to check my hcg level wich came back at a 38.1 and told me to come back to next day. so i did and he did a repeat urine pregnancy test and it was more positive looking than the last one but still a little faint, so he did another blood hcg test and it came back at a 64 , it almost doubled in one day. do you think this is a good sign that this pregnancy is going to last and are these levels normal for an early pregnacy.