If you placed all 4 day trades today, after receiving a PDT Reset you will have to wait a full 5 business days before you can place another opening trade. If you look at your "Day Trades Left" section tomorrow, you will see a 3 appear in the final day of the "Day Trades Left" section.
Accounts that have not yet been migrated to the intraday margin standards are still subject to the Pattern Day Trading (PDT) rules and are not yet subject to Intraday Margin Deficit (IMD) calls. For more information on the FINRA rule change please review the FAQs on IMD.