So I had a miscarriage ( I was only 6wks at the time of miscarriage). on Feb 29 and everything was fine after a week 5 days and I haven't had bleeding since .. Well I had sex March 14 and on Friday I took a pregnancy test and it was positive and then I took another one and it was positive also ....... I got my blood drawn today and my levels are 12.4 ..... Is that my old hcg levels still in my system or can this be a new pregnancy ???????