I think my teeth are moving, haven't used retainer for 3 months. Should I see an orthodontist?

been wearing my retainers for 2 and a half years. When I went to my orthodontist a year a ago, I asked her when should I stop using retainers and she told me to wear it occasionally or every time remember to use it. Now that its been 3 months that I haven't used my retainers, it hurts like hell and I THINK there's a small gap in between my teeth. Should I still continue on using my retainers when I remember it or should I see an orthodontist? Thank you