Loss of symptoms

I’m a day shy of 9 weeks and last weekend into Tuesday morning was feeling awful. Zero energy, nauseous all day and night. From Wednesday on, I’ve been feeling no nausea and have more energy. My boobs are still kinda sore (they’ve been sore For awhile but nothing unmanageable).

With my last child, my nausea was way worse and lasted until 11-12 weeks which I think is more the norm. Should I be worried of a MMC?

**Edited to add that HB was seen at both a 6 week ultrasound and a 7 week ultrasound.