If you conceived on day 29 of your cycle, a pregnancy test will not be accurate until 10-14 days later. It is possible you're cycle is long because of stress, hormonal changes, or a number of other reasons that caused you to ovulate later. But whether your ovulation was timed perfectly with the unprotected sex is just something you'll have to wait a little while longer to find out.
If you had unprotected sex 5 weeks ago, a pregnancy from that time would be detected by a pregnancy test.
I think I would take a test now to rule out having gotten pregnant 5 weeks ago, and if it is negative, wait 2 more weeks and take another.