First time sex atter baby

So I'm 1month pp after C-section, hubby and I just had sex for the first time and omg did that hurt but it felt so good at the same time. Anyway a couple min when I went to the bathroom a saw atiny but if blood. If that normal I'm not sure if my period is going to start it if it was the sex.? I'm breastfeeding so I thought it will be months till I get my period