Am I pregnant?

My normal period is averaged at 31 days. I’m currently on day 43. I’ve taken 3 pregnancy tests all came back negative. I haven’t been taking ovulation tests this time and we had sex 2 days after my “expected” ovulation date. I’ve never been this late on a period in fact the last couple months have been about 27-30 days. 5 days after “conception” I experienced some light spotting. But nothing since. Could I be pregnant if this far out and still getting negative tests? Also when is the latest you tested and got a positive?