Advice please!

Hi, I would like some advice please I have a very bad pregnancy anxiety and I was wondering if you guys could help me!!! My period stopped on December 21 and then on December 21 me and my boyfriend were messing around and he had came on my hand and I ended up fingering myself about 10,15 minutes later. I’m not really sure but it was around that time. I did wipe my hand off on a blanket and there was time in between we did anything. Fast forward to the next day I had taken a Plan B. because I am literally terrified of pregnancy. It scares me so I waited a little bit and then four days after I experienced very heavy bleeding. It was like a second period it was pretty much just like clots and such and it lasted about four days. On January 8, I took my first test it was negative. I took another one on January 11. It was also negative. I also took another one. Took another January 23 another on January 25 and January 26. The one taken on January 26 was taken in the morning. They were all negative. I’m concerned as the fact that my period is late. It’s late four days. I know that your period is supposed to be pushed back, but I am getting really anxious. it’s been four days since my period was supposed to start and on the day that it was late I had taken one which was the 25th. I took one on the 26th and they were both negative.