Random Bleeding??

So basically I’ve been on the pill for 6 weeks. My first pill I was on I switched to a different kind during the third week (never had my withdrawal bleed because I switched) now my withdrawal on the new pills is tomorrow. However, I am spotting today. It looks like implantation or ovulation blood but I don’t ovulate lol. And 6 days ago the condom broke so I took a plan be. I went to the doctor and she said it is very unlikely I’m pregnant. But what do y’all think this bleeding is?