Spotting or period?

Hello,

I am really worried. My husband and I have been trying for a baby for about 3 months now. I started using this app last month to track my fertile days. My period was due for July 12, but on July 4 &5 I had light spotting that was red the first day and brown the second. My periods normally are longer so I’m confused. I took a pregnancy test today (4 days before period due) and it said negative.

What could that sporting be? Did I take a pregnancy test too early?

I just want a baby..