Bleeding already?

Emily • I'm 28 my husband is 31. I am a FTM after trying for 15 months! Due the beginning of April with a little girl!
I am a FTM who is exclusively breast feeding. My daughter will be two months on Monday the 12th. I started on the mini pill this past Sunday. Today I had a little cramping which I have had off and on since delivering but when I went to the bathroom I saw that I had been bleeding. Is this normal or too soon to get a period?