Hi ladies! Okay, question. I'm 22 weeks, 5 days pregnant with my baby boy. I'm a ftm! Well, I've…

Hi ladies! Okay, question. I'm 22 weeks, 5 days pregnant with my baby boy. I'm a ftm! Well, I've been having cramping in my left rib area and it's sometimes hard to breathe, is this normal? Also, at his 20 week anatomy scan he was only in the 7th percentile with his growth but weighed at 12 ounces. Should I be worried about this? (Doctor didn't explain it well)