Right before menstruation, vaginas often get super wet but it's a little thicker than typical horny wetness. This can sometimes feel like the sensation of bleeding so it can be surprising to check and find that it's not blood. For me, I also get extremely horny around this time.
While I understand what you're saying, the Venn diagram is almost a circle. Almost all people with uteruses are girls/women and almost all women/girls have a uterus. So don't "I don't understand how girls walk around with uteruses" is a sentence that resonates with almost all girls and/or uterus owners.