Ok a labor question??

Ok so when you have "real contractions" does your stomach always tighten up ??? And if you are having back contractions will your stomach also tighten?? I am 39 wks and on bedrest due to high BP and I have to go back to L&D in the morning so I will ask the to check me...but I have noticed today that I have drastically dropped I cant see my belly on anymore I know its still poking out cause I can feel it I just can no longer see it when I look down...yesterday I could see it still and had an Ob appt and was not dialated at all and I seem to be having little crampy feelings for a min or less and shooting pains to my coota that last about 10 sec so far they are not a certain time period apart just off and on for the past few hours along with dull kinda tingly feeling in my lower back ... I am just really anxious for him to be here I havent had any leaking or water break or had any signs of loosing my mucus plug which I have heard some women dont loose until they are in full labor I just need a opinion on whether or not Im just feeling BH or it can finally be the real thing since I have dropped and waddling to and from the bathroom because he is down so low ? Thanks