It's easy for us to tell you to stop worrying. Anybody who has had TC tends to worry. We earned that right. You obviously don't have cancer. Stop over-examining. Monthly is fine. The chances of you experiencing numerous other medical conditions and kicking the bucket from something else are infinitely greater. More people die each year from household accidents or carbon monoxide poisoning than TC. Don't smoke. Wear your seat belt. Don't stand under a tree in a lightning storm.
Move along and enjoy being 18. If you don't like being 18 with a couple of junky benign things, I'll trade your body for mine.