All my tests come back + but nothing has showed on the ultrasounds.. :(

so like 2 weeks before thanksgiving, me & my boyfriend had safe sex, but the condom buster & we didn’t know until we had finished. i waited until 2 weeks before my period was supposed to start and i took two home tests that both came out positive. after going to the doctor, blood tests came back positive too.. so they ordered an ultrasound to see where we were in the pregnancy.. but they could only see the gestational sack, no baby.. 😢 does anyone know what this means???! i want a baby soo bad & the father of my baby is soo excited 😢♥️ i just wanna know if anyone may have something to say about this.. thanks.