excited and freacking out

so had a altra sound yesterday and the dr said that I have one follicle that has good size. then proceeded to tell me and my husband a plan she wants to do so at the end of this week I will be having another ultrasound to see if the size is grown to what it needs to be. then they will give me a shot to bring home and then have some fun Between the Sheets then wait for 2 days and then go in for insemination. so yes I am excited but I'm also freaking out. at the beginning of this month I was really down and out. now they're telling me that if it is successful I could know by the end of the month if it works. my mood is going all over the place hoping that it works and then the other side of me is going oh my God if it works. then the other side of me goes if it doesn't work the money having to go through it again I don't know I'm scared that it won't work but God I hope it does