3rd iui, low sperm count after washing, follicle were 16 mm

I jsut finished my 3rd iui, now am on the 2ww. The RE said my husbands sperm was a 2 for motility and there were only 4.5 million. Usually those nubers were better. Also, i had several follicles. But,t eh two dominant ones were only 16 mm when i took my ovidril. Does that seem small? Do i have any chance? and, does it seem like my doctor is being conservative and not letting my follicles get big enough to reduce the risk of multiple pregnancies? should i move to IVF, we have unexplained infertility.