So I guess everyone is different, I was told I'm in my 4th month of pregnancy but I guess since some…

So I guess everyone is different, I was told I'm in my 4th month of pregnancy but I guess since some have it up to 42 weeks, that puts me back at 3 months? Like I'm completely confused because I have 25 weeks left and I'm like are people lying to me? Like month 4 is start of the second trimester sooo? 🙄