What does implantation feel like?

Melissa • I`m a newlywed who just got married August 23, 2014. My hubby and I have officially been together for 4 years and are trying for our rainbow baby. We lost our first at 8 weeks in December. <3
AF is supposed to come 4/6...hubby and I have BD every other day since 3/17. Yesterday I started getting dull cramping in my lower abdomen. I don't know when I ovulated but I think it could have been either Saturday Sunday or Monday. Can this be implantation?