Should I be worried?

I'm a worry wart by nature, so I've been POS here and there since finding out I was pregnant on 5/8. (I'm 6w5d today) It's been giving me reassurance until my first appt on 6/5. This morning I did one and noticed that it's not pulling color from test line like it has before. Don't get me wrong I know the line is still dark, but should I be worried that it's not pulling color from control line if it has in previous tests???