Use allergy medicines during pregnancy

Patient: Hi,I have severe dust allergy and consulted many doctors. None of the oral medicines seem to work for me. Dosage of FLUBLOK- AZ nasal spray and ESIFLO 250 mg only seem to ease my symptoms. Now the problem is i am 3 months pregnant. Can i still use these medicines (2 dosages each per day) without having any side effects? Please advise

Symptoms: Sneezing, nose leakage, shortness of breath, puffy face