Late period

I am seriously stressing. I am 5 days late on my period and started getting this bur no more than around that amount. Would this be considered the start of my period? I also have tender breast since the day I was supposed to get my period. I took a pregnancy test the 31st of January and it came back negative. Last time I had sex was on January 23rd but we stoped and he didn’t cum. All the other times, I we had sex we used protection and he pulled out. Could I possibly be pregnant or is my period delaying because I’m stressing. Someone please answer :(