I bottled my first brew three days age... stuck the bottles in a plastic container with a lid. I opened the lid and heard some hissing. Didn't have time to dissect how many where actually hissing. I think it's like 2-4 out of 30. I drank one yesterday, it had carbonation already. I may have over primed it, I had 4.2 gallons and I used 5oz of priming sugar. What to do now? Find the culprits and re cap? Should I be fearful of explosions?