Most doctors (even this app) use the 10 month count down instead of the 9 months. I'm currently 35 weeks, which puts me at a complete 9 months come next Wednesday. It just depends on how you count your months, whether it be 4wks=1 month or 4.5=1 month. This is app says wks 37-40 is your 10 month, but if you're going by what your doctor told you then he's correct about you being 8 months because he's only using the 9 month countdown!! So yes tell mom (grand mom) the time is here so get READY!!
Weeks 31-35 are your 8th month weeks 36-40 are your 9th month