I never thought of it in weeks, just months, until i got pregnant and then i used weeks. I remember a couple of people asking how far along i was and i said 30 weeks and they were like well how longs that? I didnt actually know how many months because i got so used to weeks so i just said 10 weeks to go lol.

But as Trish said, 40 weeks is 9 months and 1 week, so it's only just over 9 months.