Help Navigating Possible Early Symptoms

I’m hesitant to test because I don’t want to waste the money if I’m just imagining things. I’ve been extremely fatigued (like sleeping dead through all my alarms even after a full night’s sleep and then needing a nap fatigued) for the past 3-4 weeks, and this past week started experiencing really severe nausea and vomiting. I have food allergies that can trigger this but I have made sure to avoid any contaminants since this started happening but it hasn’t let up. I also have really gnarly lower back pain.

The thing is I have a Mirena IUD, but I’m on year 7. My doctor said they are good for 8 years but I know the efficacy decreases. Is there any chance this is pregnancy or does the IUD make it impossible?