Pregnant again!

Ab

Hi ladies, I had my daughter 11 weeks ago and have had 1 period since at 5 weeks postpartum. The doctors went based off my last months period and said I'm 7 weeks pregnant. At the hospital I was only measuring 5 weeks. When I took a pregnancy test it was extremely faint even 5 days after my period would normally come. I didn't get a positive digital until 7 days. I'm thinking maybe I'm actually 5 weeks and maybe ovulated late or my bodies just off track from having my daughter so maybe my period wasn't actually late then. Some please help me put my mind at ease until my appointment! My hcg level is 11,653.