Yes it can be confusing. I would say from what you have mention you are about 1mth + pregnant. You will know for sure when you go for your next check up. Meanwhile take care cos 1st trimester is very fragile. Congratulations!
Ultrasound is more accurate. They based on the size of your sac/foetus. LMP is not accurate cos your ovulation may be late.
Probably ovulated later.. according to scan mine was 2 weeks later..
Ultrasound is more accurate.. Enjoy the journey!