Thanks for your query. As you had done your IUI on jan 31st, from your symptoms its very unlikely that you were pregnant. And the fleshy mass could be just a blood clot. The urinary problem could be just due to UTI, and the probable cause failure could be any reason, from implantation
failure to procedure failure. Pregnancy
rates with IUI is 15-20%, bust subsequent IUI cycles, the pregnancy rates increases upto 50-60%.
I hope this information has been both informative and helpful for you. In case of any doubt, I will be available for follow ups.
Wish you good health.