4 weeks into the 6 week orientation and barely making it

I feel terrible right now and im in a Surgical Ortho unit. Nurses usually get 7-8 patients. Im week 4 now into my 6 week orientation. we also get post cardiac cath patients on the floor too. i tell people that i have a 6 week orientation and my friends telling me that its too short. I think it is!. im a fresh new graduate also. I made 2 mistakes so far. One patient went down to surgery and didnt have no allergy band, and the 2nd one was that a post cardiac cath patient had a foley in and didnt see it, and i only had the patient for 3 hours. My preceptor thinks that its those mistakes are enough for the unit to let me go . Is 6 weeks too short for an ortho unit? i didnt get an orientation in the unit just in the class, and even on the first day my preceptor didnt know she had a preceptee! So im scared right now that my strict unit will let me go anytime soon. I got told by the director week 3 that i need to beef it up or else shell give my spot to another new grad. The hospital seems backward. Everything falls on the nurse and we have to kiss everyones behind. btw i work at a tenet hospital, and we have to kiss the behind of MDs who are stockholders at Tenet. Im scared that ill be jobless and be unemployed for a while and having a short employment at Tenet would leave a bad mark in my resume . I just feel terrible right now and didnt sleep all night