Sounds like early labor to me too, but it could change at any moment. Fingers crossed you go soon though!
It sounds like you are still in early labor. If this is your first baby this can last for several days, maybe a week or so. The tightening in your stomach is contractions. Keep an eye on how often it happens and how long it lasts. You should time each contraction from start to finish and see how long each one is and you should also time from the beginning of one contraction to the beginning of the other to see how far apart they are. What you saw in your underwear is known as bloody show, this means your cervix is getting ready...you may be dialating already or your cervix may still be getting ready. If you notice the tightening in your stomach is getting more frequent or becoming more painful or if you notice any leakage of fluid it would be best to go ahead and go to the hospital to be checked.
i think yes you shud call a nurse and talk to her about your pain i think you are going in labour .keep posted Good luck.