So today i was supposed to go hear my baby heartbeat super excited right get there and once again they see the yolk sac and something what they think is the baby..Now this app say im 6 weeks n 6days but as they doing the sonogram it say im 5weeks and 4 day's how is this??? Doctor said i may have ovulated later or implantation took longer im super confused..Last time i had sex was Jan 18th/19th this app said i ovulate the 22nd of Jan i found out i was pregnant Feb 10th please if someone been thru this give me you answer PLEASE!!!