Abnormal cravings are not unusual in pregnancy, but a craving for chalk could mean that you have a condition called PICA; a condition where people want to eat things not usually a part of a human diet. This may include plaster, clay, dirt, or other substances.
Chalk is primarily calcium and may not be harmful per se, but we really don't know for sure, or that this would be safe in pregnancy. For some reason, pregnant women do not want to be a part of any study that could cause possible harm to their unborn child, so the data is nil on this practice.
It would be best
not to eat chalk if you are pregnant, or trying to get pregnant. While it may be hard to prove harm, it is really not worth the risk to you and your baby to just try it.
Here is one of several interesting articles on the subject:
http://www.scientificamerican.com/article.cfm?id=osteoporosis-calcium-taste-chalk
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