Allergy meds while TCC/pregnant

Jen

I read somewhere that it's not ideal to take allergy meds while TTC because they can mess with your CM. Does anyone know if this is true and if there is any kind that is safe to use while TCC and/or pregnant? I'm currently 9 dpo but waiting until at least tomorrow to test. My allergies have been driving me crazy the last few days but I am not sure what, if anything I can take. Thanks!