Just curious If this is a blood ring or a vein? I just looked and it seems to have gone very strange no other lines are present... any help would be greatly appreciated. My first time doing this and currently on day 7 
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ThankyouI would guess a blood ring, but since it's just a "guess" at this point, I'd never be tossing an egg until I was very certain. I would just check it again in a few days or a week.
Welcome! I do know the feeling as I have hatched a lot and sometimes I'm just not sure. I put question marks on them. Out of probably a dozen question-marked eggs over the past year, I've only had one hatch, but still, there's one! Good luck on your hatch!Thankyou