There is no certain number that is "normal" or "regular." Some people have sex once a month, some have it every day. Neither one is wrong, irregular, or abnormal. It's all about preference. You're not obligated to have it any certain number of times just because you are married.
People have different sex drives; they always have. I wouldn't worry about it. You'll get in the mood when you're ready to get in the mood. In the meantime, don't make it a chore or something you feel like you have to do.