I’ve never written on here before but my period is now 7 days late... I took a test that was negative a few days after it was late and it was almost immediately negative but my period still hasn’t come

I recently joined a gym and started exercising and saw online that could cause a late period but I had already ovulated for this month and was already due for my period the same week I stared working out

Can anyone tell me if I should be worried or not? I’m 23 and in a long term relationship but we never had sex during the time I was ovulating and when we did have sex it was with a condom and I am not on birth control.