Please :( give me advice. I’m so upset..

This might be long and I do apologize. I just don’t know what to do. All my life I always told myself and others I was meant to be a mother, I was born to be an amazing mom. I love babies and kids I simply adore them. I always wanted to have a child of my very own. Especially since I found the man of my dreams, I want to have children with him. My boyfriend wants to have children as well. He loves and adores them too. There were many times when I had unprotected sex and he finished inside me.. I never became pregnant. I didn’t really understand how I could possibly NOT be pregnant. I started to think I couldn’t conceive a child at all.. knowing my aunt is like that ( it was impossible for her to have a baby, she doesn’t have children til this day). I would be heartbroken and destroyed if I can’t start a family with my boyfriend. I will feel horrible that I won’t be able to give my boyfriend children.

The questions I have are:

1- why is it that some women cannot get pregnant?

2- how do I go about finding out if I’m one of those women?

3- What should I do if I can’t?

PLEASE HELP ME :( all I ever wanted to do in my life was become a mother .