Will I be on my period then?

lola
this is my calnder when I'm on my period, I'm going on school camp on the 3rd of February, we're staying overnight. And it shows that my period will wnd the day before that. And we have to do water aquatics in the afternoon too, and I really don't like wearing tampons in water because it doesn't really work for me and I'm scared that I'm gunna leak and people are going to see. So basically what I'm asking is do you think this is accurate enough? or do I still wear a pad/tampon?