i'm 27 yrs and l've been trying to get pregnant, i missed my perid for the month of March of which does not happen to me, 2 weeks after i had a brown disharge after that i had a pink light discharge l had some pains on my abdomen and back pains period cramps painful nipples sometims fill as if l'm breast feedind, l finished my pink discharge took a home prg, taste proved negative , am i pregnant or not please help, not using any birth control