If it is a gestation sac and you're only 5 weeks then it's you don't ever really see much, because it's too early. That;s why they've asked you to wait and have a repeat ultrasound done to see if anything has developed/changed, so they're right by telling you live as if you are pregnant. All you need to do is eat healthier, not drinking or smoking and maybe take folic acid just to be safe.
They're probably saying it could be a cyst because it could look similar and because you've had your tubes tied.
Are you a doctor? We pray it is in fact a pregnancy because it would indeed be a miracle. Just confused why blood results showed nothing as well
This isn't a doctor's forum, we just do our best to answer each others questions. I agree with kitkat1306, 5 weeks is pretty early so the doctors don't want to give a concrete answer yet and that's probably why they are having you wait a couple of weeks. My doctor's office won't even give the first dating ultrasound until 7 weeks because many women don't show much until at least 6 weeks. As for the negative blood test, it's possible that either you were pregnant but had a missed miscarriage (where the body hasn't passed it yet) or that your hCG levels are rising slower than normal. They may have suggested a cyst because you've had your tubes tied and it makes pregnancy unlikely (but not impossible); cyst can also mimic pregnancy symptoms. Best of Luck!