4 Days Late Now & Still a BFN

Jade
Today mark 4 days, I've been temping and my temps have been gradually climbing for the last few days. I'm still very new to temping so what does that mean? I have my fingers crossed that I conceived but I'm afraid I didn't because I have yet to get that BFP!!! The 26th is suppose to be my last day of my period. If I don't get it by then should I go to the doctor? 
I attached my temps for the last 4 days. Today is the highest. Thursday was high as well.