I'm I pregnant??!! Spotting,late period..

Zuremi
My hunsband and I are trying to conceive since june. He was found with cancer and we had to stopped. He is better now and we are trying again. I'm very abnormal in my periods but this one is weird. I'm late for 17 day and Saturday I have some pink/bright red blood when I whipped out, so I pampered myself thinking that Sunday was going to be a havy day. Well it comes out that I was spotting some kind of brown. So I took another pregnancy test and mark negative again. I feel weird but I don't want to be thinking that I'm pregnant when I might not. I am thinking going to the doctor tomorrow and see if he can help me, but this really got me thinking. Any suggestion..? There are all welcome! Thanks in advance!! ;)