Is spotting normal when period should come and it's usually heavy bleeding the first day and this time is just spotting and no pain no cramps?

What your normal?: When patients have abnormal periods i always want to know what their normal pattern is. If most periods are normal then one abnormal one (late, early, short, long) is not usually a cause for concern. The cycles tend to regulate and get back to normal quickly. If you think you might be pregnant then check a pregnancy test.

Hormonal variation : Will cause this difference in intensity of menstrual flow . I'd recommend doing a pregnancy test. Take care!