Period again after 6 day

I`m in love
I just had a period which started on April 21 ended on 23 now 6 days April 20 I have period cramp I saw a little bleeding and later i have some brown spotting do you have any answers? I was on birth control I refil a new pack then only take two of it which was Sunday and Monday  then I stop taking birth control because I was reading about what it can do to my body cancer ect..