Could I Be Pregnant with Irregular Periods and Protected Sex?

The first day of my last period was 22nd December 2024, and it lasted 4 days. I was supposed to start my next period on 22nd January, 2025. However, I have not had it till today (31st Jan, 2025). I had protected sex on 12th January, in which condoms were used and my partner pulled out at the time of ejaculation. What are the chances I might be pregnant? Should I take a test? Am I just late? History of medical conditions: I have had irregular periods, i.e., a few days late in the past, and my cycles sometimes extended to 39 days. However, this is the longest cycle, and my last two periods have been shorter than usual ( 4 days instead of my usual 5 days). I had intercourse on 12th January with a barrier (condoms) and my partner pulled out at the time of ejaculation. Previous history of current medical complaint: My periods used to be irregular, I have recently gained weight, and I suffer from facial hair growth, etc. I also have taken Plan B pills on 2 separate occasions in the last year. My longest cycle was 39 days, and periods came a couple days after the predicted date. However, this is the longest delay I've experienced in the past. Current medication details: None History of medication for the same complaint: None lab tests done: None Height, Weight Height Weight 5' 3" (160.02 cm) 167 lbs (75.75 kg)