Any ideas

Okay so I’m on Nuvaring I NEVER spot. In over the year I’ve been on it. Even when he finishes in me it’s never happened before. Well today after sex not rough or anything. My husband asked if I was bleeding because there was blood on his dick. I’m not in my bleed week. And it doesn’t start for a week and a half. He asked if I was okay and I said yes. He’s finished in me twice the past two times we had sex within 2 weeks. So I don’t think that’s a sign of pregnancy. But I’m still a little worried that that could be the possibility. It was very light and o it lasted about 30-45 mins. Is that normal?