Am I really 6 months already ?

Leahna
I'm 23 weeks & 5 days . Am I 6 months already ? My friend sent me this weird chart & says I'm already 6 months but I thought 24 weeks would be 6 months . I'm sooo confused & my next dr appointment isn't until Wednesday & this is driving me insane so can anyone tell me am I or not? & if I am already why does it go like that ?