Blighted Ovum?

Went today for my first US and I should be 7 weeks, I know for a fact I ovulated on 1/22/25. Got my first pregnancy test on 1/31/25. Today all she was able to see was a sac measuring 6 weeks. She said I’m earlier than expected but there’s no way possible since I know my dates. My first HCG was 300 on 2/6 and 16,000 today by using the HCG calculator it’s doubling almost every 4 days. Today I started spotting light pink. I guess I should prepare for the worse 😭😭

My question is, if you have experienced a blighted ovum when did you get pregnant again and did it pass on its own? Did you take pills or get a D&C