Late period (12 days) !!

My period is late by 12 days, it was due on the 28th December and it is now the 9th January.

My period is always pretty regular (always on time and when it’s not, it’s only like 1-2 days late)

I’ve not been stressed at all, I’ve not changed my diet, haven’t been doing intense exercise, haven’t gone travelling or been on a plane, haven’t gained or lost any weight, I’m not on any medications, I’ve not been ill and I’m not on any form of birth control.

Me and my boyfriend use a condom (he also pulls out with the condom on) so I don’t see how I could be pregnant, but it’s still worrying me.

I have noticed thicker, whiter discharge that I actually feel come out, because the other day I thought it was my period and I got really happy and then I went to the toilet and saw it was discharge and I was very disappointed :(.

Should I be worried? I’m going to take a pregnancy test tomorrow.