Please help! Has this ever happened to anyone?

Le

So I got a very odd period for 6days before my actual period. It was spotty brown, not even enough to fill a pad or pantyliner. So I decided to take a test the day after bleeding stopped To my surprise I got faint positive on Christmas! I was excited but reluctant to believe bc we have been ttc for more than 5 years, so yesterday and this morning I took another test and nothing at all. My actual period is 5 days late! Do you think it was chemical or should I buy more tests??? What do I do? I'm so confused!! I've only had postive one other time in my life and got my period the next day! This odd period this time was a week before it was actually due! Has anyone had this happen to them and then found out they were actually pregnant?