Hello,
You should be able to web search a "pregnancy wheel" and find a site in which you can enter either the date of your last menstrual period (the first day you last bled) or, if known, your due date and it will tell you, assuming a normal menstrual cycle, how far along you are.
Here's a great site for you to visit: http://www.stuebegreen.com/mmp/wheel.html
The wheel at this site puts your pregnancy at 26 weeks and 2 days.
Best regards,
Dr. Downing