Judgement

My husband and I are expecting our fourth child. I'll be six weeks tomorrow. We haven't told anyone and I'm scared, too. I am a 39 year old woman, married to the same man for 15 years, and afraid to tell my mom and mother-in-law. They are very supportive and loving but have made remarks in the past about how crazy people are to have more children. This is our last child and I want this pregnancy to be a joyous occasion. Maybe I'm hormonal now but I'm seriously dreading the questions and opinions. I can't believe I'm feeling this way at my age. Are there any other mothers dreading telling their families?