I'm 19 weeks on Friday and I say I'm 5 months but ppl say I'm still 4?! Is that true

I always thought 5 months started at 20 weeks I may be wrong though

Maybe this will help?!

my Dr. told me I'll be 5 months when I'm 20 weeks,cuz there's 4 weeks in each month...idk though.lol

well I will be 22 weeks tomorrow & I will be 6 months on the 12th of next month. & I will be 24 weeks & 1 day then.

I usually don't use charts and just do the math 20 divided by 4 will give 5 so at 20 weeks your 5 months