Pre-period bleeding while on pill?

I started brith control in January and on Jan. 26 my boyfriend and I had attempted a quickie. He didn’t nut and he was barely in there more than 5 minutes. My fertile window had ended the day before. I missed one pill one or two days before the end of my first pack. Then i missed my first period - which i know is normal for starting the pill. For the last 2 days I’ve been having light brown discharge but today it’s a lot more than it has been. I haven’t missed a pill since that one at the end of January and I’ve never been on the pill before. It looks like dark brown bleeding that comes before my period...but I’m concerned either way. Is this normal?