Get tested today or tomorrow. Then get tested again in six or however many months. Getting test results now helps establish a more recent date for test results to compare with the next test results. It can help rule out previous possibilities of exposure, narrowing down exactly when the exposure occurred.
Partner notification is more reliable.
Getting tested again can confirm the results reliability. It can reduce any ambiguity another partner may have about me. It can encourage a reluctant partner to also get tested. Telling a partner my test results is a very powerful thing encouraging them to get tested. There's less ambiguity when we know each other's test results.