Nostril piercing pain?

Ok, I had this done in march. It’s now november. I had it done professionally. I washed, sterilized, everything. Most of the time it’s ok, but every so often the area around the hole swells and gets painful to the touch. I’ll take out whatever stud I have in and clean the hole, soaking it in cold water to control the swelling. I’m pregnant, so I’m sure that my high sensitivity during this time is a contributing factor. The swelling and pain tend to only last for a day or two, and are never accompanied by discharge or anything else that signifies an infection. Unfortunately because of the pregnancy I can also not take an anti-inflammatory like ibuprofin/advil. Any advice would be nice. I’m also sure that once I buy a couple more more highly-priced, quality screws this will happen less often. I also was never informed on how often to change the piercing, if that is necessary. I know of people that have had their piercings in for years without touching them - and others that change theirs on almost a daily basis. Is there a right/wrong way to handle a nostril piercing in this respect? Should I take it out to shower? Once a week at that time, once a month, no big deal? Just curious! I love the look, my nose is my face’s cutest feature and now it has an added attention-getter ;-)