22 weeks pregnant(baby 20 weeks gestation) should i be feeling kicks in my butt/lower back?

its like i feel kicks in the front but i feel little kicks in the back too,is it possible im having twins considering my mother is a twin and maybe they didnt detect it? nah! or could it be my baby movin and streching around or it is normal to feel kicks in my back.....plz help moms this my first child need as much advice as i can get