Two miscarriages - now what?

Jenny • Late 20's. TTC #1 Recovering from 2nd miscarriage at 6-7 weeks.
Just found out today that I will have my second miscarriage. The first one was at 5 1/2 weeks. This one is closer to 7 weeks after having success with our first <a href="https://glowing.com/glow-fertility-program">IUI</a>. There were two sacs but only one embryo. 
The embryo is still in there (stopped growing at 6 weeks 1 day) but with a fading heartbeat. I have to wait for it to stop before we do anything. Still debating natural vs. meds vs D&C but leaning towards natural (w meds if it doesn't happen quick enough).
Pretty heartbreaking. My husband and I are 29 and 30 and healthy - TTC our first. All of my tests came normal (Day 3, HSG, genetic testing etc). My husband just has mild progression issue but otherwise fit as a fiddle.
I'm wondering now that I've had two miscarriages in a row (a year apart) if we should move on to <a href="https://glowing.com/glow-fertility-program">IVF</a> (w genetic testing) or give <a href="https://glowing.com/glow-fertility-program">IUI</a> another shot. The doctor seems to be proposing both as options.
Currently just sad and angry that I'm the 2% that has two miscarriages in a row. Worried there's a bigger issue here that I don't know about. Nervous to try <a href="https://glowing.com/glow-fertility-program">IUI</a> again. 
Jen