I was a late bloomer. I had an physical exam I think when I was around 14. The doctor had been informed (unbeknownst to me) by my mom that she was concerned about my pubertal development. Basically my penis still looked child-like.
She obviously new I was small in height and my voice had not cracked, but she had the opportunity to examine me after a biking 'accident'. I had gotten a new bike and I was testing it's limits, seeing how fast I could go. Obviously I had to test the braking then, and when i jammed on the brakes (they worked very well!) I lost footing on my pedals and flew off the seat, slamming my crotch into the cross bar. I made it home painfully and went to the bathroom to see the damage.
I noticed there was a little trickle of blood behind my testicles and this concerned me. I didn't want to but I thought it was best to show mom since I couldn't see how big the cut was. She came into the bathroom and I was covering up with a towel, i had lost my nerve but she solved this quickly by whipping away the towel. I quickly cupped my hands over my penis. But this ended up being a bad idea as I started to get an erection.
My mom said it was just a little cut, and put some antibiotic ointment on it. She then surprised me by feeling my balls and asking if it hurt. I said it did a little but not bad. She then asked me to remove my hands. I did as she asked and now had a full erection she palpated my penis gently too and asked if it hurt. I did not, my penis had escaped injury. She then surprised me if I ever had a wet dream. I had heard of these in school health class but hadn't had one yet. I told her no, and she just nodded. In the end, It wasn't a bad injury and the pain went away after a few days.
Jumping back to the doctor, I had my normal physical, but this was my first one without mom in the room. When it came time for genital exam, he was definitely more thorough than normal dreams and asked me a few questions including if I ever masturbate and if I ever had a wet dream. I thought I was done, but he told me to sit tight and left the room. I thought I was done still, so I got dressed, but then the doctor came back with my mom. I described this experience elsewhere on the forum but I was definitely mad and embarrassed. the doctor had me undress and expose myself completely to my mom. this was worse than the injury because there wasn't a doctor in the room with us at home. The doctor said I was entering puberty but told my mom to monitor my progress and come back in the fall/winter.
My mom inspected me after I got out of the shower a few times and was very excited when I started growing a couple hairs. I sleep naked during the summer fairly often, and there was several times when she walked into my room and uncovered me to look at my penis. I always pretended to still be asleep. This also ended up being the summer i ejaculated for the first time by masturbation.
Anyway, i turned 15 and went to highschool. I was still short but it seemed everything had kicked into gear puberty wise. So that winter, my mom made another physical exam for me, I pleaded with her not to make me go, but she insisted. At the doctor he once again made me strip nude in front of mom and inspected my penis and pubic hair growth. He confirmed that yes, i had clearly started puberty and there was nothing to worry about. He went over embarassing topics of jock straps, wearing a cup, and keeping clean down there.
I have a couple embarassing jock strap stories that are somewhat related that I might share...