Really confused about how far I am, my lmp was 3/5/17. I had unprotected sex the 9th, 12th, 16th (protected) and 22nd. I got my cb digital positive 1-2 weeks on the 9th June. I had an ultrasound on the 5th July saying I was measuring 6weeks and 4 days but by my lmp I should be over 9weeks. Could I have just ovulated late?