Bleeding after sex

So my boyfriend and I have sex occasionally and it’s weird there’s times after he finishes and pulls out I’m bleeding afterwards. But there’s times when he pulls out I’m not. And when I bleed it’s not a lot it’s just when I wipe myself to clean myself up I see blood besides that I don’t bleed and it goes away pretty fast after cleaning myself a couple of times. So what can it be?? Because it’s nowhere near my period days so I know it can’t be period blood. Help please 🙏🏽