Lump ?

Rema • Mommy to be 1|21|16 👶🏾👭 Enjoying life with the most beautiful woman in the world, until our bundle of joy arrives.
Quick question does this happen to anyone at night? Does anyone knows what this is?  
So I've just noticed a few days ago that at night when I'm laying down watching tv or just relaxing that I'll get a weird feeling in my lower stomach. An when I touch it. It's like a ball or a lump. It's like as long as a hot dog an hard. But it goes away if i rub on it. I don't know if to be worried. But I'm not