Hi, I've stalked your chart! How long is your cycle normally? I does look as if your temperature has remained higher for longer this cycle. During yoru last cycle, your temperature had started to dip sooner.
Is your AF due soon? If so, then the fact that your temperature has remained high is a good sign - what's your temperature today (have you put it in yet?). However, in some people's charts, the temperature dips suddenly right before AF.
I think that is a positive sign, especially as your temperature is going up. As you know progesterone levels increase in early pregnancy, increasing the temperature further. You are right about your cold, that could have increased you temperature.