Hello and welcome,
As you suspect,your gums are affected with gingivitis
Please do visit a dentist
and get scaling done.
This is not an expensive treatment,its affordable.
You should maintain good oral health there after.
Use soft-interdental toothbrush and dental floss to clean your teeth.
mouthrinses can be used to rinse your mouth.
Include nutritious rich food into your diet.
To improve your gingival health,viiamin becosules,c,iron and folic acid
supplements can be taken.
Hope this helps.