I'm not sure how experienced you are with diving. It's incredibly common for people to get nosebleeds when they first start diving, just because they're not properly equalizing. That's anecdotal, not a medical fact. I don't think there's such a thing as a delayed sinus squeeze. I had a sinus barotrauma last year and it's something you notice because there is incredible pain. It felt like a combination sinus headache and icepick to the area above my left eye. When I surfaced and took off my mask, it was full of blood that had come out my nose. The bleeding happens immediately.

Did you experience any pain when you were diving? You are probably fine, but if you have recurring pain or bleeding you should get checked out.

I was diving for 10 years before I got my first nose bleed. It was really minimal... a tiny bit of blood upon surfacing. No biggy. The cause... likely due to the minor cold I had. I was taking oral decongestant (approved by DAN first) but that caused excessive drying out of the sinus cavity which was the actual cause of the bleeding which stopped immediately. It is the amount of bleeding that would concern me. Are you taking blood thinners for any reason? Also... if you are taking birth control pills they can sometimes cause nose bleeds. In conjunction with a dive where the assent was a little quicker than recommended... gush. If you are on ANY type of meds check the literature for possible side effects.