Help!!?

So I have a mouth uceler (canker sore) I have gotten them ever since I was little and so did my mom and no I don’t have any disease. But last night I sucked my boyfriends dick and he doesn’t have a std and neither do I. Are we ok? or are we at chance of getting a std I’m 16 btw so I’m barley educated. And He didn’t cum inside my mouth but some precum got in my mouth. Are we ok or is there any concern we should have?