Girls good evening, I'm only pregnant for 3 weeks and 5 days, I'm very…

Girls good evening, I'm only pregnant for 3 weeks and 5 days, I'm very worried about all sorts of little things, then in my side it will start hurting, or somewhere else, please tell me is it normal when the belly hurts without a break and the bladder right up to the point of being unbearable, this is my first pregnancy and I'm terrified as I really want to keep this pregnancy and the baby.