I come on my period a few days ago which was very light and I didn’t fill one pad…I then had brown blood that looked like discharge with a stringy texture I then stopped for two days and have come back on and the same thing is happening I’m also on the pill I’ve took test and they have come back negative but one looked as if it had a very faint line that u couldn’t really see but the rest were negative I’m not sure what to do or what it is….is this normal??