My breasts are only slightly tender, but my nipples have become more sensitive and have gone bigger. I don't have much feeling on my tummy except that it is slightly bigger (probably because I have eaten too much lately, cos' I feel hungry all the time recently).
I guess what you are experiencing is qutie common in early pregnancy. But if your tummy is really uncomfortable and if it lasts for long, you should probably go to see a doctor wor. When I had my first child a few years ago, my tummy got really really tight and got quite big one night (1-2 days after I had a positive pregnancy result on the tester). That was quite uncomfortable, but that only lasted for about one night. Some said that the discomfort may be caused by the expansion of the uterus which I have not really experienced much in my last pregnancy or this one. Besides, I have never had m痛 before, so I can't feel how serious your pain is and whether it resembles the kind of discomfort I had in my last pregnancy. Sorry, it is all the info I could share given my limited experience. Perhaps, other mums could share more of their experience with you.