I'd be peeved and annoyed, for sure. However, I don't think I'd be bringing it up again after the fact.
From you've described she seems slightly self absorbed/self important and even naive; you're right, you don't encourage people to come over and interact if you're unwell. You'd especially think she'd want to be more cautious given you're pregnant.
The situation would absolutely p!ss me off, but I'd most likely just keep my distance rather than waste my time addressing it with a person who will more than likely react in a defensive manner.
She sounds quite impulsive and selfish, but I do think that in her mind/heart she probably wasn't fully aware of the damage it would cause. You have a history with going into premature labour, the last thing you want is an illness/infection.
Also interested to hear what her reply was to your text....
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