Plan B Confusion

So I had sex on my first ovulation day and semen spilled out of the condom onto my legs but just to make sure I took plan b in less than 24 hours. After my ovulation was done I had sex a few more times and had a period for the second time that month. I looked into implantation bleeding and my period was a few days early but it was 4 days like normal hurt a lot more than normal and had clots and uterine lining and all that...but now a few weeks later this app says I was supposed to have my period two days ago and I have not. I took one early detection pregnancy test like a week and a half ago and the other before my period that say negative and I am having cramps. I am so confused about what is going on. Anybody else have this?