I had cramping at 3 days past iui and light spotting on day 4 isn't it too early to be implantation?

Ovulation symptoms: It's too early for implantation which happens about a week after conception or iui. If you took fertility drugs like Clomid (clomiphene) or letrozole, cramping may be from ovulating more than one follicle. Spotting can occur from touching the cervix during the IUI procedure, or from a drop in estrogen hormone after ovulation until Progesterone kicks in and stops bleeding. Do a pregnancy test 2 weeks after iui.