Thank you for your rquery.
Mostly, early pregnancy
, particularly the first trimester is associated with weight loss
Also, such dramatic increase in size in clothes without weight change is unusual.
It indicates that you are putting on belly fat,
, that too, 10 years after it, chances of conception are very remote I would say.
However, in the presence of the alarming symptoms you are having, it is in your best interests to go for a detailed check up.