vaginapagina | vaginal bleeding after bowl movement

Over the last several months, I have noticed that my period would sort of start earlier than usual and would start break through bleeding either after sex or after a bowl movement. I asked my doctor about what is causing the early break through bleeding and she said that I may need to switch pills if this was bothering.
So, I thought if I just extended my pill pack( I started a new one early, because the old one was going to expire soon), then maybe that would fix it. But today, after having a big BM(sorry TMI), I noticed breakthrough bleeding(light pink to bright red color).

Has anyone else had this happen to them? Is it just the pills not having enough progesterone anymore? Or something more serious?

I am getting really annoyed by this! Please help!