So excited! But nervous !

Jessica
Hi my fellow first time mommies! My husband and I just found out yesterday we are expecting our first baby! We are so thrilled, we have prayed so hard for this baby! I'm kind of worried tho because for the past couple of days I've had some light cramping and every once in a while I'll get a sharp pain but it'll go away in a few seconds. Also some back aches ,are all of these normal in early pregnancy? I'm approximately 3 1/2-4 weeks.