Late period with strange spotting or Pregnant??

Je

According to Glow, I started ovulating around Jan 12th, then had sex with BF on 6th, 11th and 12th, all of them which he came in a condom, but there was a few mins of full penetration before he put on a condom.

I have been having spotting since 19/20 Jan for 6 days, Which was dark to light brown, sometimes pink to very light res, during that I experienced headache and started to eat a lot. (Granted work was super stressful and I travelled a fair bit these two weeks)

As of today 29 Jan, I am 4 days late for my period, just wanted to ask with your experience, how likely is this pregnancy and how accurate would the result be if I take a test now?

Would be grateful if you can share your view on this. Thank you so much!