I’m scared

I’m 15 and I had my first period in January of 2018 and it only lasted 2 days. I haven’t had another since. It’s currently July. Was it even my period/ should I be concerned? Idk if it was actually my period but if it was i’m really concerned that something may be wrong. I’ve talked to my mom and she said that my hormones may just be screwed up and that it’s normal to have an irregular cycle at first, but we’re closing in on day 200 of my cycle. Any advice???