Praise be to Allah.
You did well, praise be to Allah, and the interruption because of illness does not matter, because illness is a legitimate shar’i excuse, and interrupting the fast because of it does not affect anything. Once you had completed three days after that, the fast was valid and you had offered expiation, praise be to Allah. End quote.
Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on him)