Ummmm my HCG levels were all wacked out when I found out I was preggers.
I was a day late for my period and got the spotting (implantation) and i just knew. I waited 6 days to a wekk to take another test cause my first came back negative.
I went to the doc. to get the OK and they did all the test and I was preggers but when they did the u/s there was nothing. not a sack not anything.
There was no trace of a baby at all.
My last period date would have made me at least 7 weeks so. . . I don't know.
Sometimes it's just the dates that get wacked out. . . I wouldn't stress.