Okay Bubbaroochie, your post reminded me of something that happened to me, however I will preface with noting that I did not go through the same treatments you have.
In 2009, I went on clomid to ovulate and on the first round fell pregnant. We DTD as instructed by our specialist on the appropriate days, and then about four days later (from memory, which is pretty scratchy), I had some seriously weird "twinges", even spasms near my uterus. When I say weird, some of them felt like my ovary was almost vibrating. maybe impantation? I don't know, but we did end up pregnant on that cycle.
Best of luck.