I'm not sure if I have Diastasis Recti or not and I was wondering if someone could help me out.

I just started hitting the gym recently this is my third week. Today was the first day I went heavy cause I finally felt like I could get back into it after a couple years. I'm 20y, Male btw, I did abs today and went pretty heavy intensity wise at least compared to what I'm used to for abs.

I got home and I just noticed that the gap where my stomach is like the top two abs is abnormally large today. This is a first for me, never had something like this happen. I was looking online and found Diastasis Recti. I've always suffered from back pain cause, one I'm tall, and two I had a back injury when I was younger so the back pain aspect of this doesn't help me figure out if I have it or not. I also did the finger thing, and I feel resistance pushing back from that specific area. which from what understand means I don't have it. but I'm not sure.

Is there something else I can try to figure out if I have it or not, can I fix it with the exercises if I do have it or is it a permanent thing that can only be alleviated. and could it be something else. I just did a quick research and Diastasis Recti is the only thing that shows up.