still not pregnant

Well I'm going on two years and I have not came up pregnant since my topic pregnancy with their chewable. I'm scared to go get tested to see if my other tube is clogged and if I'm able to come up pregnant. Yet I still try every month during fertile time and yet I still don't come up pregnant. Maybe it's just a sign that I am not meant to have any other children. I only have one son that will be four years old and I fear that I cannot give him a sibling.