Hi I Am 2months Pregnant On 6th Week Of Pregnancy

Hi i am 2months pregnant on 6th week of pregnancy i didi sonography but nothing seen in it.dr recoment me hucog5000 injection i took it twice in two weeks during 7 th week ultrasound not shows anything so dr stop my injection frm last two weeks and he says you r not pregnanent but today i have complete 2 months and my hcg test is positive what it means