What to do when you get sick?

Amy • Trying for our first. Excited and nervous.
I caught a summer cold, not a big deal, but I feel like I can't trust my numbers, esp temp and weight. What do you guys do when that happens? 
​I am in the data-gathering-before-trying phase. I just got off birth control for the first time in 12 years, and I only wanted to data-gather for 3 months. Is this the huge setback I am thinking it is? Is the whole month of data scrap? 
 
 How do you guys handle an illness?