Late (maybe skipped?) period... Needing help!!

In need of some help, as I have never dealt with this before... I have never had a late period in my life, so the fact that I’m 10 days late concerns me. This last month, me and my husband used the withdrawal method, which we know isn’t a reliable BC, but we’re at the point where if it happens, it happens. We had sex quite a bit during my “fertile” week, using the withdrawal method. I was expecting my period to come at its usual time but it didn’t. I had been on BC up until 4 months ago and even these past few months, it has always come on time. I have no stress going on to cause a late period in life in general or with being pregnant because we are fine with it either way... so stress isn’t the cause. I’m in great health. I have been having a few pregnancy symptoms and a lot of my coworkers seem to think everything is adding up to pregnancy, but so far 3 tests have been negative. It honestly feels as if my body is trying to tell me something is up because I just feel different? Last time I had taken a test was a few days ago. When is the next time I should test? Is this late of a period normal with really no reason? Should I go to the dr if I continue to receive negatives? Thanks in advance! ❤️