Can you help?

If the test was negative you should probably wait for a few more days and take another test, assuming you're still late.

The crying could be hormones, but I'm guessing you're emotionally invested in this, and anything is a trigger, so I wouldn't count on the crying to tell if you're pregnant. 

I know it a terrible strain.

Brown discharge is old blood and is normal unless it lasts for 10 or more days straight, or if it has a foul odor.  If it has a foul odor, this indicates infection and needs to be seen by a doctor.  Implantation bleeding is usually pinkish and spotty, and nothing like a period.  This could be part of implantation bleeding, or normal discharge.  If your regular period is at least two weeks late, I would make an appointment with your doctor to have a blood pregnancy test done, as this is more accurate than any home test.  I might add that on average it takes a couple a year to conceive.  If after a year of trying you do not become pregnant, both you and your partner should both see your doctors for an exam and testing, and possibly referral to a fertility specialist.  The most important thing is to try and be as stress free as possible, as stress can affect fertility.