Should I Be Concerned About Delayed Period After Losing One S Virginity Especially Since We Used Protection?

My girlfriend and I had sex for our first time in 4 years being together and we’re both 21… so she’s very worried that she might be pregnant… surprisingly I’m not freaking out as much as her cause we had protection and I pulled out 10 seconds before I ejaculated… but she is now 3 days late and today will be the fourth if she doesn’t get it by the end of today… I dont know what to do she’s freaking out mad crying and saying she hates sex and does not want to do it anymore… and as her lover it hurts me but I don’t tell her cause she just feels scared…I’ve read and asked many older women and they say it’s normal to get a delay when u have sex… especially for your first time… and the. Stress on top of that…. Should I be worried??? I need help!!! I feel bad and I want her to be in peace…