Ay, mommy, that nipple pain in the mornings is really uncomfortable, please check with your doctor soon, lalo na may concern ka about pregnancy, para ma-rule out kung ano talaga ang cause. Hindi ko ma-advise kung buntis ka or hindi based lang sa pregnancy tests, kasi marami pang factors, pero ang nipple pain ay pwedeng maraming reasons, best talaga na doctor's check. One of my mum friends had similar discomfort and it turned out to be something simple lang, but she felt better after getting checked. Hang in there, sis!