Am I more fertile on my period?

Kathryn Elizabeth • 🤰🏻+👼🏼+🙏🏼+⏳+👨‍👧+🐶🐶+💍+🏡+🤰🏻+👨‍👩‍👧‍👦+🤰🏻 Athena Lynn 09/03/13 Brandon Paige Jr. 11/30/18 Baby Zoey Due 04/20/20

My boyfriend and have recently been thinking about starting our own family. In addition to his daughter of course. But I woke up this morning with a little bit of blood. I am supposed to start tomorrow. So this could be period or spotting from implantation. I’m not really sure. But he said it was okay and that we might conceive while I’m on my period because I’m more fertile then. And so I’m just wondering what a more experienced mind thinks on it.