Pregnant but might not have a baby

First IVF cycle and got a positive result but the HCG levels weren't where they needed to be. After many bloods, levels have rose but again not where they needed to be.

We've now been referred to the early pregnancy assessment centre where the ultrasound ruled out ectopic pregnancy but measured close to 5 weeks instead of 6.

We have to go back in two weeks to see if it's viable. We've been told to brace for a blighted pregnancy. The thought of going back through IVF then this again is terrifying.

Anyone else going through this?