Jeanie,
I didn't feel or look preggers untill about six months.I saved my weight gain and the "BUMP" till the 6 1/2 month mark.The last few weeks , I put on about three lbs a week.
How very exciting for you.Do you know the sex?I delivered a 10'6 oz Baby Boy 11 years ago, currently a 5'5, 118lbs 5th grader
Congrats!!