Opinions

So I've been kind of spotting for the last few days. Its like discharge but with a mixture of blood mixed in and has a strong smell. My last period was July 29th and lasted about 4 days and the month before that I had one start the 23rd and last 6. Well i was wondering if Anyone thought maybe I could be pregnant or maybe its just my cycle trying to start? Been worried cause some time around the first part of June me and my fiance had sex and I let him cum inside me in the heat of the moment and I've been,off birth control for a while for health reasons. Yes I know if I think I'm pregnant to take a test but you can't take a test until after your missed period and mine won't be late until 8 more days so I'm just asking for opinions cause its been on my mind . It wouldn't be the end of the world if I am ,things would just change. We already have a 2 year old son and currently rooming with my best friend and splitting bills.