Help please ???

So me and my fella have been trying for a baby for a few months, we tried for a baby on my peek fertility day, the day after I spotted on my period for 10 minutes on the 6th of September. Last week my coworkers said I wasent been my self and I seem to be exhausted since then, my period was due on Thursday 21st but I dident come on so I took a Normal and a clear blue digital test the next morning and they both showed up negative. I am still not on my period and it's 5 days late, I just need advice as this is my time trying and I'm not sure what to do now 😔 can anyone help ????