Dr appointment

Well I finally made a doctors appointment because I haven't had my period since September 21st and I have on and off had pregnancy symptoms but keep coming up with negative tests. My husband and I are dissapointed and just want to find out if something is wrong so we can conceive. I truly believe it will happen when God wants it to but I feel we should be proactive. Has anyone else had similar issues and know tests I should request or questions I should bring up? Thank you!