Should I test

Karie • Mon, Sep 25

Af was suppose to start the 24th and it's never late I tested this morning on the 25th with a cheap dollar one I've been packing in my purse and it was negative. Could it have been a false negative my boyfriend and I haven't been careful this month he came in me 4xs during my ovulation should I retest with a better kind or should I just wait for Af ?