Panicking

I’m currently 5w and 3D after a FET. When I first got my BFP I had nausea, bloating, cramping and tender boobs. Then about 2 days ago all of my symptoms seemed to disappear.

I tested 2 days ago (top), this morning (middle) and this evening (bottom) and am worried my lines might be lighter.

I also had an Ultrasound today where they saw a gestational sack, maybe the start of a yolk (but unsure) and no signs of an embryo or heartbeat.

I now have to wait 10-14 days to have another ultrasound and I’m feeling like it’s all over 💔 it took us 9 years to conceive and I am so worried.

Does anyone have any advice please?