I would take an at home pregnancy test as of today. Then I would wait about three days or so then if no period occurrs within the time you are waiting then I would take another at home test to see. And compare results. If both positive good sign. Within three days you do start you're not pregnant. If you happen to not start within three days I would test again for sure.
If you think you could be pregnant take a test(:
You usually ovulate about 14 days after your period.