I agree with the above posters. I'd be listening to the sonographer, not the GP. With this Bub (I'm 39 weeks) we couldn't see a foetal pole at 6 weeks on the external ultrasound, only a gestational sac. Did she have an internal ultrasound? Even if she did, it's possible she ovulated a couple of days later than she thought she did in which case it would be very normal not to see a foetal pole at all.