According to my OB's wheel 7 months begins from week 25-28, 8 months 29-32, and 9 months 33-36, then 10 37-40. Technically we are pregnant for 10 months
I'm 26 weeks 4 days myself. Maybe the system means you are 7 months at 27 weeks because at that time you have 90 days left to go. That's 3 months. The beginning of the 7th month, the eighth month, and until the end of the 9th month.