If you had been taking them already for the previous 4 months, and had just started the next pack, then you are most likely safe (no birth control is 100% effective). You are protected from one pack to the next if you take them as directed... without missing any.
If you had been taking them for 4 months, stopped using birth control pills for awhile, and just started taking them again, then you have less protection after just 3 days. Ideally you are on them for about a week, if not longer, to gain the highest protection.
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