Is my period late or what?

I am 30 year old and have always been pretty regular 28-30 days… We are trying for another baby, so I am not worried about being pregnant, (we are not tracking ovulation or anything, just going with nature..) I am just not sure if I am really “late” now since my July and August periods were weird. From June to July I only had a 20 day cycle, then from July to August was only 25…. Now here I sit on day 30, no period. So, am I late? Is my cycle getting back to the normal 28-30 days? Not sure when I should consider myself late… I am thinking if I have no period by Sunday I will test, however with my first baby I was a week late before I got a positive. The waiting just kills me. So, should I consider myself late now or what?

Thanks