Urge to Test before Ultrasound

Casey • Baby Sides due 3.29.16
I'm currently 5 Weeks, 2 Days and sooo happy but also sooo nervous. Our ultrasound isn't until 8 Weeks, 4 Days. I keep fighting the urge to go buy the weeks estimator tests and take them once a week until them. Would that even make sense? Sorry, first time momma here 🙈