Ovulating....or not

So I’m not sure I am ovulating. Took some tests this week and haven’t gotten the two dark lines. I’m going to make a doctors appointment for myself.... I’m scared. No.... I am terrified. What if I’m told it’s not possible for me to get pregnant. My sister in law can’t have kids and it has been so awful for her. She’s a lot stronger then me though. I’m just.... scared.