Pregnant with Myrena in ????

Kelsey • 21 |I like animals more than people🐝|Married 🌹| Tattoo and piercing supporter🤘🏻|PCOS fighter💕
What is the possibility of me getting pregnant while having the Myrena (the 5 year birth control) in? I've had it in since January, and these past few weeks I've been having multiple symptoms of being pregnant, (really moody, appetite changing, smells making me sick, dizziness, horniness, exhausted) but I was told this is extremely rare and pretty much won't happen... Should I buy tests ?