Hi there and welcome. If your period was due end of April, I'd think by now you'd get a positive pregnancy test. They sell an over the counter test that is early response. I used those and they pick up the hormone really early. anyway, try another pregnancy test in the near future.
There is always a chance of pregnancy when we have unprotected sex. Unless you desire a baby, I'd always use protection as a solid rule. good luck
I waited 2 weeks after my misses period to test. Do it as soon as you wake up. That's how I found out I was pregnant some bleeding is due to implantation of the blastocyst, nothing to be worries about