One of my friend ask me same ques about pregnancy ...again..?

She keep ask me " do u think im preg." she like said she had with her boyfreind like 3 times abt 16 days after period..... and end up she have LATE period... spotting.. then heavy period then stop like 3 or 4 days then after that start feel cramping...... so she want to know is still can be pregnant? or not... pls help...HER. lol