Can I be pregnant?

I am so confused. I have an irregular period since I came off depo provera last year march. I had my period on 20 August and then this month according to my app I was about 2 days late, only to have a brown discharge for about a day and then a very small amount of bright red blood. (Sorry if its too much info). I have been having some pregnancy symptoms but got negative tests. Did anyone else go through this and ended up being pregnant? Im planning on taking another test in a couple of days or going to the doctor.