My Wife Is 6 Weeks Pregnant And We Do Not

my wife is 6 weeks pregnant and we do not want the second child now as our first one is very little/young, just an year old so we met with an doc who prescribed unwanted kit. this kit has 5 pills. one big one is of 20mg and rest 4 are of mcg. as per the doc, my wife needs to have 20 mg pill any time in a day and then needs to have rest of the 4 mcg pills together after 48 hours after the consumption of the first one so would like to confirm this is correct dosage to have it.