The answer depends upon the way your “horrible allergies” effect you. For example, is the allergic disease in your lungs (asthma) , your nose (allergic rhinitis) or your skin. The classes and the route of administration can differ for each of these.
Medical evidence strongly suggests that the most commonly used drugs, for the treatment of asthma, are safe for both mother and fetus.
In general topical (directly applied to skin) meds are also safe.
While antihistamines are generally considered safe, uncertainty remains because of a lack of strong evidence to confirm their safety.
Two suggestions: 1) discuss this with your obstetrician and, if you have seen an allergist, with him/her, before taking any medication during any stage of pregnancy and, 2) visit the following website from the Center for Disease Control (CDC): http://www.cdc.gov/ncbddd/pregnancy_gateway/meds/index.html
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