lost....

I'm having a very hard time staying positive. My husband and I have been ttc since March of 2017. I know it's not even been a year but at 26 I never thought I would have trouble conceiving. For the first 4 months my period was regular. However in September I skipped my period and now I haven't had one since November with 3 negative test. I'm so confused on when or if I ovulate, when to test, or what to do next. My dr won't help me til we have tried for a year. Just looking for support or help or advice. Thanks everyone!