TTC 10 days late with spotting

Ok I need help... I am 10 days late and just had 5 drops of spotting and it turned brown like it was over... The month before this one I started 9 days late with a period that lasted 4 days but was heavy for first two days but it normally lasts 7, usually my periods are every month on the same day or maybe one day late and last 7 days The last month I tested when I was late and all tests were negative so I haven't tested yet this time because I am nervous to be disappointed.. Am I sikeing my self out or could I be pregnant I'm going to buy a test tomorrow what's your opinion