Kidney infection

Summer • Momma of two kids! TTC#3

Went to the doctors the 12th found out I have a kidney infection been in severe in back he gave me a antibiotic shot and sent me home with antibiotics to take...it’s the 15th and I feel much better no pain when peeing but still have slight back pain. Is that normal? Also upset stomach think it’s from the antibiotics tho and I’m on my period started the 12th lol almost off. How long did it take you to feel 100% better