I’m anxious and paranoid

So I had sex the first week of summer vacation and we did it three times that day and we used protection twice, and I was like 2 days late. Then we did it again same thing and I was 4 days late. I’m supposed to start today and honestly I’m terrified. We didn’t use protection at all this time and I feel like I’m gonna be late again. I’m super scared. What should I do? I’m trying not to stress because I know it pushes it back further.