Advice

This was my first week with my new family. The parents are nice and the kids are too. My hours are supposed to be 6-4 M,W,F with more days in the future. This weekend MB told me I would be starting at 9 M & W and at 6 on F. She also told me she would be with me this week. MB let me go early on all days. For one i was expecting to work my hours this week and two l was definitely expecting to get paid my full amount. However, I was only paid for 18 hours instead of my scheduled 30. On top of that MB said we would be doing 6-3 instead. I can see where she is coming from in a way these are their first kids and i am their first nanny and maybe they don't understand guaranteed pay? But should i say something now or wait until it comes up again. Ive never had this happen before. My previous family went on vacation the first week I started and i was paid no question. same thing when they were away for a month. I have 4 months left of online classes and this works for my schedule rn. i was even considering just toughing it out until then.

** guaranteed hours were discussed and i do have a contract**