www.nhs.uk/chq/pages/935.aspx?categoryid=54
Think you misread that babyH is certainly doesn't say it's the only one..
and loratadine is a non drowsy too 
(copy n pasted)
Always check with your GP before taking oral antihistamines (antihistamine tablets) when you?re pregnant. Pharmacists are unlikely to sell antihistamines over the counter for use in pregnancy because of manufacturers? restrictions.
You can take some oral antihistamines when you?re pregnant, but not others. Oral antihistamines can help relieve itchy eyes, a runny nose and sneezing.
The antihistamines mentioned in this section have not been shown to cause harm to the unborn baby, and doctors consider them suitable for use during pregnancy.
If you can?t use nasal sprays, nose drops or eye drops, or if they don?t work for you, your GP may recommend an oral antihistamine called loratadine.
Some oral antihistamines can cause drowsiness. These are known as sedating antihistamines. However, loratadine is non-sedating and the preferred oral antihistamine for treating hay fever during pregnancy.
If loratadine is not suitable or does not work for you, your GP may instead recommend another oral antihistamine called cetirizine.
The sedating oral antihistamine chlorphenamine, is also considered safe to take during pregnancy. However, this should be avoided close to labour and childbirth as it can cause problems in the baby, such as irritability or tremor (shaking).
If you become drowsy after taking oral antihistamines, do not drive or operate machinery.