Lmp was 07/02 due again 7/30 but came 08/07 which was 8 days late. my cycle is 28 days. should i expect it on 08/27 or 09/04 since this one was late?

Periodicity of cycle: Menstrual periods do not always come at the same time like clockwork. If ovulation is absent the cycle can be prolonged if not on hormonal contraception. Normal ovulatory cycles are between 27 to 35 days.

Hard to say: When periods are irregular then it is hard to predict what is going to happen next. You can monitor them and if they continue to be irregular you can see an Obgyn for cycle regulation options. Often things go back to normal after a random one month variation in pattern