For IUD users po mommy, some experience changes in their cycle, including late or missed periods. Since you’re breastfeeding po, that can also affect your cycle kaya po nagiging irregular.
Having cramps without bleeding can be common din po, but since you’re already 8 days late, it’s a good idea to take a pregnancy test na or consult your healthcare provider just to be sure. They can give you the best guidance based on your situation mommy.