okay found this on a pregnancy website so maybe it could help xx
Eye drops containing antihistamines, such as Otrivine, are safe for you to use. If you haven't used antihistamine eye drops before, just use a small amount to start with, as some people are allergic to them.
You could try a drug called sodium cromoglicate. It is sold over the counter in the form of eye drops (Opticrom), or a nasal spray or drops (Rynacrom). These products have to be used several times a day to be effective. They do not contain steroids and are thought to be safe in pregnancy. However, there are no formal studies to confirm their safety, so use them carefully