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i thought i was haveing my period, but it was littler then normal and i discharge brown light tissue. and as the days went on the blood got lighter and lighter. like i was just spotting. my nipples look larger and darker,i've been tired more but not every day,and to day i feel a little sick to my stomach.and i have been haveing touching on my belly button on and off for about a month now. so can i be pregnant?