Testing

So, I am not due for AF for another week or maybe two.. Hubby and I BD on my most fertile days and multiple sessions, and then some after my fertile window. I know it is way too soon to test, but I caved and tested today. It was negative. My question is, is it still a possibility to be pregnant even if I tested negative way before AF? I have been off of my BC for almost a year now. (Since April) and BFN are starting to make me feel so sad... also I am on antidepressant. I was on Lexapro, but recently switched to Effexor. Could being on antidepressants cause issues while TTC? Any advice or suggestions will be appreciated.