as you know i have no way of examining your eyes over the internet but it is not uncommon for anyone (including someone who is pregnant) to break a small blood vessel in the eye from throwing up. you may have a subconjunctival hemorrhage. these can look absolutely frightening but they are no more serious than a bruise on your knee and will resolve in a week or so. bright red at first then brownish and then back to normal. again this is really a guess since i can't see your eye so if you are worried or concerned please consult your medical provider.
i have morning sickness & threw up this morning and popped some kind of vessel (not blood) in my eye near my tear duct. it looks like an additional bump near my tear duct in the pink tissue of my inner eye. there slight redness in inner eye.