Am I pregnant?

I was supposed to get my period earlier this week and got some spotting a day after I was supposed to get it. I'm usually super regular and heavy and lasts 3-5 days, this is the first time it's only lasted a day and just spotting. I took a pregnancy test yesterday and it came back negative :( It could be stress that I'm missing my period...

I've been off birth control (patch) since July 16th so the hormones from the birth control could still be in my body. What did you guys do (except having sex) to get pregnant? Let me know by replying. Thank you!!!