Pregnant or not?

Hey ladies so I had sex with my boyfriend on the 31st of August, he came in me about 3-4 times I didn’t take any plan b , I was suppose to get my period 27th or the 28th of August but I was late .. Sep 4th I had spotting a light pink with a little bit of red .. today Sep 5 I woke up and there was blood like I was on my period .. ( I also have been super tired and have backaches ) am I pregnant? Should I take a pregnancy right away or wait another day ?