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Hi and welcome.
Blood shot occurs due to a subconjunctival hemorrhage. This happens when one of the tiny blood vessels in the membrane covering your eye bursts. It’s usually harmless and goes away in a few days to a couple of weeks. The hemorrhage itself is generally not painful. Generally migraine cause bilateral red eyes instead of blood shot in one eye. Sometimes sudden increase in blood pressure can cause this which is also associated with headaches. I would suggest you to monitor your blood pressure so that any such episode can be ruled out. Blood clot will eventually dissolve on its own so nothing to worry about that but cause should be known.
Let me know if you have further questions.
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