Slow heartbeat 7 weeks

[Whattheivf]

Hi everyone. Looking for any advice and reassurances.

I had my 7 week scan today after a successful IVF cycle and everything looked perfect BUT the heartbeat was slow at 90bpm.

Doctor said it should be above 100bpm and google suggests it should be above 110/120bpm.

Back in a week to see if things have progressed.

Prognosis looks all bad online - please, any success stories?