I am breastfeeding my 7 month old and my periods have not returned yet. I am on birth control but my life isn't exactly conducive to taking a pill everyday at the same time so I've been late taking one once or twice lately. With my son I experienced implantation bleeding about 10 days before my missed period. Almost a week ago I bled exactly like I did when I got pregnant with my son. I took a pregnancy test a couple days ago and it was negative. How do I know when it would be positive if I am pregnant because I do not know when to expect a period? Also, about a month and a half ago I experience cramping for about 4 weeks straight with no period. I have never had bleeding with ovulation or spotting like this except when I got pregnant with my son. Please let me know if you have any ideas of what it could be or when the pregnancy test would show up positive. :-) Thanks!