Is this a watermelon? Or something else?

I live in southern louisiana. And about a month or so ago, a plant started growing on the ground right by my porch. It ended up taking over everything around it, I was thinking it was a watermelon. It had yellow flowers, and then small melons started growing all over. They look JUST like little watermelons, but I've noticed a few started turning yellow. Theyre a little bigger than a golf ball now. I'm just hoping it's not some weeds. My brother goes hunting and I went once and we saw some kind of melons growing in a ditch that looked almost like these. I dont want to dig it all up it it's actually a watermelon. My mom said she's gunna cut it with the lawnmower tomorrow, so can someone give me any kind o info? We ate watermelons on the porch Quite awhile before i notice this plant growing, so if it is watermelons, it toook awhile For them to grow. I'm not sure what these melons that grew in the ditch are called? I'm pretty sure they're no good to eat tho. But I'd appreciate any information! Thanks!