I took a pregnancy test and came out positive, but the ultrasound does not show any implantation. What do I do?

It usually takes about 6 weeks for anything to even show up on the ultrasound scan. It may be too early to tell. Give yourself a few more weeks and try again. http://www.babycenter.com/400_can-an-transvaginal-ultrasound-miss-a-pregnancy-if-youre-onl_8121798_284.bc