Hey NorthernOntario,
I guess a puff here and there is okay. It's up to you and your doctor to decide if this is okay.
However, keep in mind that some women do lose weight during their first trimester. Try to talk to your doctor about it. Also, do you have severe morning sickness? If you do, you may have hypermesis gravidarum, which could be the reason behind the weight loss.
See your doctor! And good luck