Is this normal?

Paige • 👼 April 26, 2019 👦 July 22, 2020 🤰April 29, 2022

So my last period was Jan 31st. I should be about 11 weeks pregnant. When I was at 8 it showed I was only measuring 5. Had another ultrasound yesterday. Still only 5. They are calling it a blighted ovum. My thing is I'm already "11" weeks.... no bleeding. Since finding out have had slight cramps here and there. How long should I wait before needing medicine to help end this or a d&c? How long can it take to even start to end?