Implantation or late period??

I’ve been late for my period by 3 days and started spotting today and stopped after an hour or so.

The thing is, I took 2 home tests in the morning and it ended up being negative.

I had unprotected sex during my ovulation, but I’ve also been sick for the past 2 weeks so could it be that my sickness/stress is causing my period to be late or am I too early to test?