Is it still possible?

So my husband and I have been having unprotected sex, and he’s been “finishing” inside of me every time ( I listed a photo below of the days we’ve done it. It shows what each symbol means ) I’m not sure when I should be testing if I’m pregnant. I tested last week but my mother in law said that it was too early so I tried again today and it still says no... I am not supposed to have my period till April 6th. Is there still a chance I may be testing too early? And if so should I wait until I don’t get a period