confused...again

been low carbing for two weeks now but still confused on the testing....I test before breakfast and dinner then again two hours after but i also take my meds 1000mg metformin and 160mg glyclazide during both breakfast and dinner and surely the meds are giving me false readings of my true glucose level....sometimes before dinner if my level is a bit low i then leave out the gliclazide as per docs instructions

thanks jack, my reading was 5.2 before dinner so i left out glyclazide and 2 hour later reading was 5.8