Period is late by 5 days

Hi ladies, before I even say anything please if you have something negative to say just keep it to yourself. I was with one guy in the past month and when we had sex it was protected. I was supposed to get my period on Valentine’s Day and it still hasn’t come. It’s not usually this late and I don’t feel any cramps or symptoms so I’m worried. On Saturday I took 2 pregnancy tests and I had my best friend there for support, they both came back negative but I’m still not convinced. I know stressing does not help and only delays it but I can not help it. Taking a shower or bath or any other de stressing activity will not work because the thought of being pregnant terrifies me. I told the guy today what was going on and I was so nervous he was going to ignore me but he responded in such a helpful and relieving way. If it does come down to being pregnant, he said he’ll take care of whatever I want to do but have any of you experienced such a delay in your period? Please only serious comments