Coincidence or not?

My 21w4d and my baby girl has been VERY active today. I’ve been feeling her little kicks all day. Suddenly this evening I’ve been having having some aching in my mid-upper back (feels like I’ve been doing heavy lifting) and I have some minor belly pains as well. Would her constant movements having anything to do with the pains I’m currently having? FTM here so I don’t know a lot of these things. Still learning every day 💁🏻‍♀️