Anyway after doing another 2 ivfs, Today with my 4th i got a postive blood test

I had 2, 7 cells grade 2's put back in on Friday 7th of May, therefore only 10 days ago. Since they went back in I convinced myself af was coming but i had a blood test today and postivie pg hormones were shown in blood test.
The count was only 39, the hosptial said they'd like to see them above 50 so I have to go back next week.
What i'm needed to know is did anyone have low blood counts, and does it really mean anything? the hospital said as far as they are concerned it was a postive test result so not to worry too much just take it easy just like my 2ww.
but I'm just starting to get concerned about the blood levels, any advice greatly welcome.
thanks.