I can barely see it so I can't say. But I've noticed my males show their sex before the females. So if you're at day 7, you have a little more waiting time. Some plants won't show their sex for up to 14 days. Be patient. If it is a male, it's not going to pollinate right away. You have some time. If you think that's a hair, you should know for sure within the next 3 days or so.