How long after a c-section until you get your period? I went to the bathroom a little while ago and…

How long after a c-section until you get your period? I went to the bathroom a little while ago and (tmi) I noticed brownish/red discharge in my underwear, not a lot just a small bit. I'm about 5 weeks post-partum, could this be my period starting or no? If not is this normal? My hubby and I played around a couple days ago but we didn't go all the way.. so I don't know if that would have caused it, especially two days later.