I never felt them with my first 2 pregnancies either. And i still went into labor naturally. With my 3rd ive been getting them since around 19 weeks. Every pregnancy is different and just because you cant feel em doesn't mean ur not having them. Once you get closer to your due date ur dr will most likely do a stress test and youll be able to see if your having them.
I'm pregnant with my 3rd and I never felt them with my first 2
You might have not even noticed that you have been having them. I never knew until my dr told me i was having one. You dont feel anything but when you touch your stomach its really hard. If concerned talk to your dr about it.