Brown Discharge/Back Pain?

Hi all! I’ve just started on the Opill about almost two weeks ago and it’s been working great so far. Although in the past week or so I’ve noticed some slight lower back pain (I could have done something to it, my job is very physical.) and today I just noticed some brown discharge/spotting. I started it about the second or third day of my period. And my boyfriend and I had sex three days ago with a condom & he even pulled out when he finished. I’ve been taking them on the dot every day.

Anyone else experience this? I just wanna make sure I’m good. 😃