Someone hacked my Yahoo mail account, but didn't change my PW. Is it possible to view what was sent from my account if the hacker emptied the trash folder?

Someone recently got into my Yahoo mail account and sent out links to websites that host viruses. Luckily they didn't change my password and my friend told me about the email so I quickly changed my PW. Is there a way to view what e-mails were sent out if the person deleted them from the trash folder? Most of friends just got one email, but one is telling me she got 5. I'd like to know what someone was doing with my account if possible.