Intentional orgasm 9 days post 3 day transfer. Still having occasional cramps. HCG test in 2 days. Concerned implantation was interrupted verses assisted. Was attempting to increase blood to uterine wall?

No effect. Orgasm should have no effect on your ability to conceive or the status of conception. By the way, you're not increasing blood flow to the uterine wall, but rather to the clitoris.
No effect. I do not believe that orgasm will have any positive or negative effect on implantation.