Symptoms but no period?

Alright so I’m having a problem.

My period was supposed to start about 4 days ago, but it hasn’t. I do have sex with my boyfriend, but we have been very careful about using protection l recently. But in the past few days I have had cramps, nausea, tender breasts, and hot flashes (all super common before and during my period). My problem is that I am normally very very regular and I’m not usually late. Do I need to be concerned? Do I need to get a pregnancy test? Should I just wait it out and hope it starts? Any advice is helpful!! Thank y’all!!