Birth control

So I just started a new birth control beginning of June, just I higher dosage of the one I was on. Now it is beginning of July and no period, my last period started in May. According to the app I am 20 days late.

Since the switch I feel more nauseous, cramping, and such. I decided to take a pregnancy and was negative. Just wondering how long it took your bodies to adjust to a new birth control?