Trying to lose weight but I don't think it's working

Ok I'm 22 yr old female, 5'10, 184 lbs. Athletic build, but i do have some belly fat. I wanna get to 165. I looked at a lot of calculators and told me that I should be eating around 1900-2000 calories daily, but i decided to go 100 calories below (1800). The first 2 weeks was better good. I was at 180 lbs. But now for the past 5 weeks, my weight has been going up and down. 2 weeks ago, I was at 177, and then next week I was 181. I don't know what I'm doing wrong. I workout 3-4 times for about an hour, eating pretty clean, and I pick one day where I have a "cheat" meal. SOMEONE PLEASE HELP!

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