How many months?

So this last week I have been making myself miserable thinking about how I was only 5 months along and that I will start dreading my long miserable pregnancy any day now... Then I realized that for being college educated I sure am not smart. I recognized on my LONG drive down home that months don't have 5 weeks in them and so that means if I am 25 weeks then I am really 6 MONTHS into this pregnancy. I cannot believe that I have been telling everyone that I am 5 months instead of 6. I think that I will just go by weeks, it is easier to add!