Feeling so down and depressed...

My sister in law who is 34 just announced yesterday that she was pregnant. I'm happy for her I really am I hope her and her husband have a beautiful baby. She never wanted children though and the only way she got pregnant was because she took some antibiotics that interfered with her BC. My husband and I have been TTC for about 5 months and I am 10 years younger than her. It's too early for a specialist and even then my insurance won't cover it. I feel like deep down something is wrong with me. But I probably won't ever know....