Need Some Advice

So Guys I Don't Know What The Deal Is Or What's Going On With My pregnancy As Of Right Now When I Went To The Er They Said I Was 6 Weeks And They Heard The Heartbeat And Gave Me The Ultrasound But The Ultrasound Look Like A Whole Bunch Of Dots... Than When I Went To Go For My 8 Week Appointment My Sac Measured 7 Weeks With No Yolk Or Baby.. So Than They Made Me Come Back Again And They Now See A Yolk Sac And No Baby There Not Really Sure But They Said They See A Start Of Something... So Now Again I Have To Go Back July 12th I Am So Confused Right Now Because I Don't Know How Early I Am And Especially I Took A Guess On My Period Because Im Not Really Sure Because I'm Irregular But I'm Praying That Everything Will Turn Out Fine And My Baby Will Grow ❤️🙏🏼