What is happening to meeee??!! 😬

So I’m kinda panicking right now. A Month ago I took plan B (yes I know I should be ok birth control and yes I know plan b isn’t the best thing for me but I had to) on the last day of my period. Two days after that I started bleeding and bled for six days straight. I’ve had protected and safe sex since then but a month later my regular period hasn’t come. So I’ve taken four pregnancy tests spread out over the two weeks since my regular period was supposed to come and they’re all negative. Not even a faint positive line. However, my boobs are tender, my right nipple looks slightly different, I’m fatigued, and I’m moody. I see no signs of my period coming soon but what’s happening? Could all those pregnancy tests be wrong? I’ll keep testing but what do you think? Also my vag kinda itches...