Negative pregnancy test and late period

Hi everyone,

So my period is 10 days late. I took 2 pregnancy tests 2 days ago and they were both negative.

I’ve been on birth control for 5 years and I stopped taking the pill in January because I was just starting to not feel great on it. Two weeks after i stopped the BC I took a plan B because I was worried that the condom may have slipped. My period came normally in January after the plan B.

It’s now day 38 of my cycle, and I’m late. I don’t think I’m pregnant but the unknown is scaring me so I wanted to know if something like this has happened to other people.

Thank you 😊🥰