I wouldn’t worry or analyse it too much, we’re meant to put on 2 stone just from the weight of baby/excess fluids etc alone!
Agree, our bodies do know best. I felt so anxious about it all too but trying to let go as like Colette says, we are meant to put on weight in the end. Once the nausea passes it does definitely get easier.
Throw away your scale. Tell the doctor you’d not like to know the numbers. Now is not the time to manage your weight
Try to eat smaller amounts even if you eat frequently. Once the nausea passes and you’re feeling better, perhaps after 16w, try to go back to your pre-pregnancy eating habits. It is difficult to restrict or control yourself when you’re unwell, so focus on only controlling your food intake in the weeks when you’re feeling well. This helped me find a balance and not restrict myself at all times