The tightening could just be braxton hicks-i would get a tightening across the top of my belly- but not a constant one- it would come and go- also it would happen if i spent too long leaning over on the computer or just in an uncomfy position- try laying back on your back and relaxing with some deep breaths. Not too sure about the belly pains and soft poo's.... have you been a bit blocked up (lol more tmi needed- ie have you been constipated in the last few days?)

Are you still feeling bubs move? Have you had any funny colour discharge?

If your still feeling regular movements and no yucky stuff is coming out- i would say its nothing to stress too much about- However i am a better to be safe than sorry kinda gal.. so when is your next drs appt? If its soon- i would wait and mention it to your dr or midwife- but if its still a few weeks away i would make one sooner just to check if you may have a slight infection or something.

If you are in alot of pain or really worried- just call your hospital and be put through to the maternity ward and ask a midwife if you can come in for some monitoring- they will check bubs heart rate and movements and take a urine sample to see if there is an infection and that might be enough to reassure you. You can do this ANYTIME night or day and they SHOULD say its ok- depending if they are having a really busy night there or not!

Take care HTH