Pregnancy ?

I had unprotected sex 2 weeks ago - almost 3, since I felt really bad bloating and my period was meant to start on the 15th but hasn’t. I took a digital test and came back negative (later found out you’re meant to take them 1 week after a missed period) but today I had some either spotting or implantation bleeding? It was just one wipe and a tiny bit of blood and brown blood. I’m not sure what’s going on and I plan to take another test in a week to make sure but I rarely never miss a period so this is really unusual for me.