i guess what your doc was saying is that you ovulated about 2 weeks beforehand - which makes sense - he just didn't word it right!

i would wait another 2 ish weeks (makes you 6weeks) before seeing the doctor - given the confusion with dates by this GP you may be sent for a dating scan

oh, and LMP is fine to go by IF you have a 28 day cycle - if i went by LMP for my two natural pregnancies (which i lost at around 5 and anywhere from 9-14 weeks) i would have been as much as nine months on that theory!