Caused By Pregnancy?

Hi ! I Soo Need Help PLEASE ! I Had My Last Period In June It Came On June 18 And Ended On The 22 Its Been 52 Days Since My Period I Missed My Period For July And Its Aug.14 And Still No Period I Had Sex On July 25 Of My Cousin Law Birthday And I Just Got Out The Shower And Like I Was Super Tired And It Felt Like I Had To Puke Everywhere And I Been Havin Like Back Pains And Little Stomach Cramps , And I Also Have A Yeast Infection For About Four Days And I Look It Up And It Say Its Cause By Pregnancy ! Can I Be ? SOMEBODY HELP HELP HELP PLEASEEEEEEEEE !