Final answer:
A client with a 2-month gap since the last menstrual cycle and a positive pregnancy test is likely in the first trimester of pregnancy, which encompasses the initial 12 weeks after fertilization.
Step-by-step explanation:
If a client comes to a women's clinic stating that her last menstrual cycle was 2 months ago and she has had a positive home pregnancy test, the nurse would determine that the client is likely in the first trimester of pregnancy. The first trimester begins at fertilization and lasts through the next 12 weeks. Considering that menstrual cycles can vary from 21 to 45 days in length, the fact that it has been approximately 8 weeks, or about 2 months since her last menstrual period, suggests that she is within that initial 12-week period.