I'm sorry, I don't know for sure, but in my herbology studies, blueberry wasn't on the list of aborticants. If the blood sugar problem is a temporary thing, then I don't know if it would help that much because apparently, according to the article, it helps over a long period of time, you have to keep taking it for awhile. If she is worried about a future problem with her blood sugar, then perhaps she should wait until after the pregnancy and then start drinking the tea (if she's worried about a contradiction with pregnancy), or start drinking it now, but just like a cup a day, and see how her body adjusts to it.