if you are going to get tested, your partner should too. Just knowing your status is only half of the picture as well as if you recently contracted herpes from them, it might not be reflected on your igg blood test results.
what makes you think you contracted genital herpes? Have you been seen yet for your symptoms?
if indeed you do have genital herpes, herpes antivirals will help control it even with your iga deficiency but it's important to be seen promptly if you are having active symptoms.