My last period was from June 6th to June 9th. I got a negative pregnancy test on June 30th and on July 4th, but a positive one on July 7th. My periods are regular and usually last 28-32 days. Today I went to the my ob and he did a quick ultrasound. He just measured the femur and the head. The head gave me a reading of 16 weeks and 6 days while the femur gave me a reading of 18weeks and 1 day. My MA is 16 weeks and 2 days. If I would have gotten pregnant in May wouldnt the June 30th test come out positive instead of negative? And also, when using ultrasounds, do ob's use gestational age which then I would actually be about 14 weeks instead of 16 weeks? Right?
Help, Very confused