Not sure how does Ramzi works

Audrey • I'm a first time mum and baby will be due end of July! My husband and i are very very excited!
Hey ladies! Today i went to my first appointment did an ultrasound and im 6w4d (i thought i was 8w already based on LMP).. It was real amazing watching my little bean inside me! :)
Not sure how ramzi theory works but if possible help me with mine? :)