I Can't Lose Weight, Help?

Well, I can, but it's more like I stopped. My highest weight was 182 a month ago (I'm 5'3) and this morning I was at 172.8. Here's the problem: Whenever I get to 172, I bounce back up a couple pounds or don't move at all, but I'm not changing anything about my diet. Is this a plateau? It feels kinda early for me to hit one, especially since I have another 22 pounds to go to reach my target.

Any tips? I swim almost every day, no pop or sugary drinks at all really, I cut out read meat, I don't eat from the bread group and I try to eat at least one vegan meal a day, so I'm not understanding what I'm doing wrong. And I try to eat about 1500 calories a day, which seems pretty reasonable because I swim for 90 to 120 minutes a day.
I Can't Lose Weight, Help?
Post Opinion