Spotting but no period and ive taken 4 pregnancy test...

Hi, I have been having a problem since about July.I didnt start my period in July or August. Then in September i finally had my period it was normal and everything. And then last month i didnt start my period but now for the past 2 weeks ive been having cramps and then theres a pink tint whenever i wipe or have discharge.but that only happens sometimes i havent had sex since my last period so i have no idea whats wrong with me. and before,back in july we used condoms everytime and nothing broke or had holes in it so idk what in the world is going on :/...any ideas?thank you