help!!!!!! What do y'all think?!?!

My last period was july22nd. I had protected sex woth condoms on the 5th and 6th of august. This was probably around the time that i ovulated, but I used a condom with each act and I made sure the condoms didn't rip each time. I had sex on the 18th and 19th of this month as well. On the 18th after we had sex, I had one little pink sit on toilet paper, but I believe it might have been because I hadn't had sex in a while ando was a bit dry. Anyway, this app showed that I was due to start today. Sometimes the app is right, sometimes it's not so I never go EXACTLY by how it shows. When I wiped this morning when I went to the bathroom, there was one single little pink dot on the tp and after that, I haven't had anything else today. My breasts have been sore since the 5th on this month. I don't think it's an abnormal symptom or pregnancy symptom because it started during ovulation and it hasn't gotten worse or anything. I'm just curious what are my chances that i could miss my period and be pregnant... I used all of the condoms correctly at the beginning of this month as well as this past weekend when we had sex.