Keep in mind your mucus plug is the size of a fist.. It would be very noticeable if you lost it all at once.. Most everyone loses it slowly.
It means that your pregnant..... Lol. I've been losing my mucus plug for a week and my stomach is hard too, because the baby is growing and there isn't much room in there anymore that's all that means.
I am wondering the same thing. I believe I lost my plug Sunday but not 100% sure but my stomach has been hard constantly but no contractions. I go to the doctor tomorrow so I'm going to ask. I'll let you know!