I know this is a TMI question but I am 4 months pp and I'm on my period again which is what ever but…

I know this is a TMI question but I am 4 months pp and I'm on my period again which is what ever but i have noticed that when I wear a tampon I stop bleeding. and I'll stop for a day and then I can wear and pad and start again. does anyone else have this problem? tampons hurt me(always have even after pushing out a 9lb baby) but I just don't get why I ALWAYS stop bleeding just to start back up again when I think I'm done