Chances on people thinking I'm pregnant?

Last period started on 22nd September and finished on 28th September. On the 22nd September, only for a few seconds but still did it, had sex. My period carried on as normal and like I said it was only for a few seconds but I do know that could still get you pregnant, you never know. I haven't had sex with 22nd September. My next period from then was meant to come on 22nd October (Sunday) and its not come yet. I've had tender breasts, aching stomach and thighs, back ache here and there like I normally would but nothing like I normally get with period pains. I use the app 'clue' to track my periods and I try to put as many symptoms down each day as possible. It's now the 24th and I know it's only 2 days late and I could have ovulated or something later, but what do you guys think? Please, if you're going to be immature or say anything rude or make silly comments then just don't even have an input, anyone who has been in this situation knows it isn't a nice feeling and also before anyone says, 'should have used protection' oh yeah like everyone else who has had sex before has been careful every single time? No they haven't. Just please give me some sensible suggestions and try and help me. Thank you 😊