Baby’s movement?

I felt something hit on my belly. I don’t know it was the baby moving or just two glup kinda feel. The third one was very mild. Interesting! I am 4 months pregnant and I thought that from 5 months, women start feeling baby’s move.
Ran 3 miles, slow and easy. It took me 30 min to finish. Been feeling uncomfortable under my abdomen for couple of days. Thought I might ran long distance. So, from today, I will cut down my milage and let’s see how I will feel.