Can't feel contractions

Okay ladies. I'm in my 3rd trimester. 27 weeks. But I'm a bit concerned. This is my second baby. We are having a baby boy this time. But with my daughter, I didn't know u was in labor. With her I went for my check up to see if I could be induced at 39 weeks. She was due July 24. But was born. Here's why. I went to the doc and he said I'm active labor. I was lost because I wasn't hurting. I just thought it was pelvic pressure! My water didn't break. It wasn't nothing like j had prepared for in birthing classes with her. They immediately called the ambulance for me. My husband looked at me like how I didn't know and so did my parents. I was expecting excruciating pain! But it wasn't like that at all. Just felt like I had to poo bad with pelvic pressure. The dr said I must have pain tolerance and I don't see how because I hate needles and cry like a baby. So now I'm worried bout my son. What if the same thing happens??