I don’t even know where to begin.
So I’m 14 years old, weight about 52kg and I’m about 1,63 m tall.

I’ve been working out for a while (30 minutes almost every day) and my stomach was relatively flat, but since a week or so my stomach has gotten way bigger, even though I still weight the same as before.

Also, my stomach has been hurting for like a week straight. It’s not the kind of pain when you’re sick, when I get up my entire stomach area just starts hurting like hell. I’ve been thinking about seeing a doctor, but I thought that it maybe just was because I’m growing.
I haven’t been able to work out simply because it hurts so much, and I haven’t been eating unhealthy (eggs for breakfast and some random stuff for lunch, but no junk food or anything like that).

Is something wrong with my body? Should I really see a doctor?
Btw, I’m sorry if my English sucks, it’s not my native language.