I almost got stuck doing something similar. Went to a semi-nice restaurant with a girl I am seeing and was fully planning on going back to her place(she had to get a sitter to go to dinner) and hanging with her and her bastard kid, then my single buddy who works nights and was supposed to work called me and said he got the night off and asked if I could go and he would go pick up the tickets. She was like "go have fun", so my night was saved. 
Danielson, girls with kids always let you have your way in the beginning. THey don't want to scare you off by seeming needy, jealous, and desperate. They want a permanent man right aways, PERMANENTLY
let that be a warning to you. check you condoms for pin holes in the package