Pregnancy Unknown Location

LMP is December 2. P and I had contact on Dec 9, 20 and 30. Missed my period ng Jan 2 so I decided to take a PT on Jan 8 which is positive. Tapos on January 9 naman positive sa blood serum test. Had my transv utz on January 12 pero ang result is Pregnancy Unknown Location. Anyone who had similar experiences? Advise kasi sakin is bumalik for repeat transv after 3-4 weeks. I am worried.