Brown bleeding before period while on birth control

This morning I woke up to brown blood on the toilet paper when I went to the bathroom & it’s still happening but I’m on birth control and my period isn’t supposed to come till next week. I haven’t ever missed a pill since I started birth control in January and haven’t had sex in over a month. I’m a little crampy today and tired, does anyone know what might be going on? This is very abnormal for me and I’m worried.

(p.s. my boyfriend broke up with me last week and I’ve taken it really really hard so idk if that could have anything to do with it)