Yes, extra weight can disguise pregnancy for quite a while. Also, a first pregnancy often does not "show" for several weeks and each person is different so it can be hard to guess pregnancy based on appearance.
I would not be concerned at this point. Even thin women may not show at this point; others will.
Best wishes and good luck in your pregnancy.
The answers in online forums are for information only and are not intended to substitute for medical advice and care. Please see your personal health care provider for further evaluation of your individual case.
Debbie Miller, RN