I think it's a Squash!

I have this pot with a strange looking melon.  It has big leaves but no tendrils.  The leaves also seem to have a  veiny pattern, unlike my other melons that are just pure green.  Among the seeds, I've been throwing into the garden, I only had two other candidates: a watermelon or a squash.  However, a watermelon's leaves look more like small Christmas trees, not like this which is a little heart shaped.  I think it's a squash! And it's a big one too.  I better remove the basil and the 101 tomato seedlings sharing the pot.

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