Periods and Pregnancy

So normally my period comes on every 23rd and last about 10 days. When my period does turn up late for whatever reason , it will arrive NO LATER than the 28th ! Today is the 29th of January and I still have not gotten my period. I've had lots of unprotected sex where he came in me every single time and I'm not on any type of birth control . I put on a panty liner just in case aunt flow wanted to arrive , and the only discharge I have was this ... 

Could I be pregnant ?