Ok so i've got a question about menopause?

Ok i dont mean to sound stupid and ignorant, but my sister and i are curious. Does being pregnant a bunch of times extend your time before menopause becasue you arent haivng a period for nine months every time you are pregnant so that's nine eggs you didnt use up right? we're just a little curious becasue well we have a big family, two girls(19 1/2 and almost 18), four boys(16,13,9, 6) and my mom lost a baby to a birthdefect 10 years ago our mom just had a miscarriage three months ago she's going to be 42. So i guess it's were wondering if by having so many pregnancies did she add like 5 years on before she'll go through menopause... please no rude answers i'm serious i know this may seem a stupid and almost inappropriate question but i want to know, just keep in mind i have my reasons for asking.