Go for it. I'm doing EC (elimination communication) with my daughter and she's pretty much potty independent at 20 months. We started at 2 weeks, so 14 months sounds late to me :D
Now seriously, if your son is regular, you can put him on the potty at the time for his bowel movement and sit with him. Read books and relax. If he still strains to get the bowel movements out, he may be constipated--just keep an eye out for this and consult your Dr if it continues to be a problem.
When you go to the toilet, take him along and let him sit on the potty and play with a toy. My DD usually starts to pee when she hear me go--similar to the sound of running water. . . Be consistent with you pottying. Clear communication is important too. Talk to your son, encourage him, and if you get a reward great if not, let him know the potty's there whenever he needs it.
Look into EC for more tips:
If you'd like more ideas on a gentle, natural approach to early toilet introduction, look into "elimination communication" For more information see: