no withdrawal bleeding on my 4 day pill break

hi, so i’ve been taking the pill for about a year now and 2 months ago i never got my withdrawal bleed for the first time ever during my 4 day break (i’m taking the microlite pill) and i thought nothing of it and just hoped it would come around the next break but still no! i’m back to taking them everyday now and i haven’t bled in over 2 months. i took a pregnancy test after the first time and it was negative so im not sure if i should take another one just incase.

can anyone help :(