Need encouragement

Chelsea
Ugh! Just needing some encouragement. Have been TTC for 8 months now. Tried clomid for 2 cycles without success, now have a big doctors bill, since my insurance doesn't cover infertility :( and still not pregnant. I have two beautiful girls ages 4 and 2 and a half. I got pregnant with them within one month! I don't understand why I can't get pregnant now.