Please help Pregnancy after miscarriage?

i had a natural miscarriage that started on 31/10/08. i was between 5 and 8 weeks. i had a blood test and the 3/11 my levels were 1200 then again on the 5/11 and they were 600. I ped clots and bled ALOT. i got treated last week for an infection, i started feeling sick on sunday the same way i did when i was pregnant before so curiousity got the better of me today and i did a hpt and it showed positive. i've slept with my husband in ped two weeks and now just dont no what to make of it. i would love it to be positve really but wondering could it be?