No heartbeat yet?!

Suzanne • One ☀️ baby👧🏻2/14/17, one Angel 👼🏼Oct 2018, one🌈👶🏻 11/21/19 All conceived via IUI

Anyone ever experience going to the first ultrasound appt and not seeing a heartbeat yet? I’m measuring 5w6d-6wk exactly. No heartbeat today. We conceived via <a href="https://glowing.com/glow-fertility-program">IUI</a>, they think maybe it is because of the actual implantation date. I’m trying to keep positive thoughts but I’m disappointed.