I heard a "pop" in my ankle and am concerned it is my achilles.?

I was playing softball, running to 2nd and went to slide. When I did, I'm not entirely sure what my ankle did, but I heard a pop and am pretty sure the 2nd basement heard it as well. I didn't have significant pain, and was able to get up and stand on it right away. When I went to run again, that's when it hurt in the posterior aspect of my ankle. I can do bilateral heel raises, not single heel raises. I iced it once I got home, wrapped it up and started having pain on the lateral surface of my ankle. When I palpate along the achilles, I have no pain and everything seems to be attached. I did the calf squeeze test and my foot plantarflexed as it should. Moving into dorsiflexion when sitting is difficult and stiff posteriorly and causes pain laterally. When I stand on it, it seems stiff and painful in the posterior region of my ankle/lower calf. When I walk, I have a hard time pushing off. Could this just be a bad sprain? Or is is sounding like a partial achilles tendon rupture?