I think your girlfriend is right on!!
Congrats!!
I used a basic due date calendar (that uses the average 28 day cycle) and counted back two months. I put in August 27, 2008 as the date of LMP (last menstrual period) and it came out with a due date of June 3rd! If her cycle is longer, that could bump her due date a few more days down the week. So the dates are only a week off ...I wouldn't say that's a huge discrepancy, so she's most likely pretty close.
Yep, women are actually preggos for 40 weeks which is actually about 10 months.
If she is due on June 11th, she is about 7weeks 5 days...which is close enough to 8 weeks. Women are pregnant approx. 40+ weeks, its more than 9 months to be exact. You can go online to any side that figures out the due date. For instnace, go to www. babygaga. com (had to space otherwise it wont come thru). Plug in June 11th and click "get your custom pregnancy ticker". It will let you know that she is indeed almost 8 weeks pg.