2 period in one month. (detail)

well I had a period on the 4th of this month, normal light for a day or 2 then heavy for a couple of days as well. I have cramps on and off for the first 2 days. last night me and husband were having sex, after we got done, he had some blood on him and even hand size on the bed.... I am using a small pad now, just a little is on it. no cramps at all either. First time with this. normal? btw I have irregular periods, I can go 20 days to 35 days.