Worried question I have...

Rosalie • Mother of two Izy and Jr plus one iguana named Crixus im a Pisces and I'm 22
I am 18 weeks and 3 days pregnant with my second and I'm having that bruised pain down there which is weird because I didn't get that until after I dropped with my son at 27 weeks is this normal at 18 weeks I am heavy set thinking that could be it I'm already having that heaviness in my abdomen plus that bruised pain just kinda worried