[Perfectlap]

Nope. You may have a leak elsewhere. Lack of coolant is not your big problem. It's why the coolant droped that low in the first place ...and that you've been driving around with air in the coolant system. When was the last time you checked the coolant level, and last time the coolant was flushed? If you take that cap off now you may be nixing what little pressure that out-of-date cap can hold.
Do yourself a big favor and bring it to your Indy today. The minimum coolant line is not really a polite suggestion.
Also, check the oil dip stick. Anything weird?

p.s.
A trick I used to see the coolant when it's dark or hazy is to flash a light behind the coolant tank. I used my smartphone's video flash the other night.
I could perfectly see the exact level of pink coolant. The white plastic makes it hard to see sometimes.