If you have been tested for the active thyroid hormones, Free T4 and Free T3, please post those results and their reference ranges shown on the lab report.
Levothyroxine (T4) is relatively slow acting. That is why doctors occasionally prescribe different doses on alternate days. So since you essentially missed 3 days, I see no problem if you take 2 pills on alternating days, until you are caught up.
Just curious. Since so many people find that T4 med dose not give them adequate Free T3 to relieve symptoms, I wondered how you feel on your regular dose. And what is your daily dose?