Most feed Co.'s will use one of two types of medications in there chick starter as a active ingredient in there medicated poultry feed.
One type is,
Amprolium which goes by the trade names Corid and Amprovine, Amprolium, Amprol, Anticoccid and is a thiamine analog, competitively inhibits the active transport of thiamine (B1).
According to the Amprolium site there is no withdrawal periods in both eggs and poultry meat.
The second type of medication used is,
Lasalocid goes by the trade name Bovatec. Bovatec (lasalocid) is a coccidiocide that kills coccidia. It is an ionophore that moves potassium, sodium, calcium and magnesium into the cell causing the cell to burst. Bovatec works primarily on a single developmental stage of coccidia, providing a more narrow range of action than Deccox.
There is no withdrawal required because Lasalocid is confined to the alimentary canal of the bird.
Now there is a some feed Mfg. that also add BMD to the feed along with a Cocci-stat. BMD (Bacitracin Methylene Disalicylate is used to treat and control Necrotic Enteritis caused by Clostridium perfringens. BDM also has no with draw date.
Your eggs should be good to eat.