Cramps and Constipation?

Is it normal to have mild and sharp cramps that feel like my period in early pregnancy? Also what can I do for constipation. I drink a lot of water and I walk a lot. My first apppointment with my doctor is on the 21st. I have an appointment today for bloodwork and an ultrasound but I wont be seeing a doctor today. Natural remedies would be best! I would really like to avoid taking medications if possible.