Spotting light brown 3 days before period

Hi so me and my boyfriend have been trying to conceive for 3 months now my period are always heavy and dark red .Monday and Tuesday I went to the bathroom and seen light brown Discharge same thing happened Wednesday then Thursday I had light bright red bleeding it was on and off into Saturday when it completely stopped I never have bright red periods I been having some symptoms like back ache , bloating feeling a little nausea I’m really confused I need help ??