Kinda freaking out

So, my husband and I started using Preseed today. Now I'm spotting. I've never bled after sex unless it was around the time of AF. I looked up some things and it's kinda got me freaking out because it said it could be cancer. And I know it's crazy and they say everything points to cancer, but I had cancerous cells burned off my cervix when I was 16... Is there anything else it could be?????