I'm TTC, BFP this morning ... then 2 BFNs at lunch time :(?

When you are taking a pregnancy test this early in the game, you need your pee to be as pregnant as possible---first thing in the morning is best. Hormones are very low in the very beginning and tests have a hard time picking them up before you have missed your period. It is very rare to have a false positive--unless you are on some weird meds or some other unnatural cause. Take a test in the morning if you want to, or wait a couple more days when your hormones will be at higher levels.