Bladder infection?

Nikki • I`m 30 engaged to the love of my life! Pregnant with our 1st child!!
I'm 19 weeks along, Monday I had this horrible pain n pressure in my lower abdomen. By Tuesday n Wednesday  it wasn't as bad, which Wednesday I have my anatomy scan! The pain n pressure Is bad n making feeling sick to the point I wanna pass out! Do u think it could possible a bladder infection???