Relationship on Period??

So there’s this girl I fancy and I talked to her and we both like each other. But I’m on my period and my emotions are always like 10x stronger than usual. I just got out of a relationship and I don’t really know if I’m ready for a new one. We’re meeting tomorrow to talk about it and I’m so stressed. I just want to make sure I’m feeling the right things and my period isn’t affecting my judgement. What do we talk about? How do I tell her I’m not ready?