first timer tampons

so my life sucks bc I'm 14 and I've had my period only twice and i'm pretty irregular (considering i started in january). my periods are always super light and I've never used a tampon.

I have this science project where we have to make a boat out of cardboard and try to make it across the pool and we swim after and have a picnic. seems fun right? well not anymore bc i just started to spot yesterday and now i have to get in the water and swim or i fail. ik it may seem like not a big deal but I'm freakjng out. I'm a very tiny person and i don't want to miss out. And thing that rly sucks is how much work I put in my project and how I've been looking forward to this all year.

UPDATE: so i wake up this morning and absolutely nothing at all. Should I worry