I’m scared that I cant have children

I’m 27 going on 28 my boyfriend is 29 going on 30....we’re trying to have a baby and I still haven’t gotten pregnant after 5 months of trying. He has two children from his previous marriage and both children were conceived with no effort what so ever. I think his exact words were “ We knew exactly when it happened because it was the few times we didn’t use protection”. I’ve been to gynecologist and I’ve never been told I can’t have children but then again I’ve NEVER attempted to have any before either. I came off the Birth control about 6 months ago. I’m due to my gynecologist appointment soon but I’m really scared to hear that I can’t conceive. Im really tempted to just put off the visit. I know thats not the best way to go about this but I honestly don’t think I can handle bad news. I’m honestly beyond terrified. I haven’t even brought up the concerns to my boyfriend. All I’ve ever dreamed of is being a mother and I don’t think I can handle it if I’m told I won’t be able to conceive additional children to our family💔