It is not your place to give medication to another female through her partner. She does not know where they came from, who gave it to him, or why he has them. Anyone would be suspicious of that.

Also, giving away medication is dangerous as our chemistry in our bodies respond differently, and if something were to go wrong, you could face some major problems (even legally). Pills and other forms of hormonal based medications need to be monitored by a physician because of the numerous side-effects that can happen.

You did step over the line, but you had good intentions. Just learn from the mistake and apologize. Let him know that you can take responsibility for your actions.