Ovulations test

lovetheglam • Poshmark Reseller 🙋🏽‍♀️
Hello , i need help reading ovulation tests, and when to take them ;( 
I know i sound dumb, but everytime i test it is negative. 
I got my period June28th, and it ended July2nd. 
Also , if i had sex after my period ended & i think i am pregnant right now would it be too soon to test? 
Help please