from that one parameter it actually sounds like he has a normal sperm count
copied and pasted the following for you:
The World Health Organisation provides a definition of a 'normal' sperm count:
the concentration of spermatozoa should be at least 20 million per ml.
the total volume of semen should be at least 2ml.
the total number of spermatozoa in the ejaculate should be at least 40 million.
at least 75 per cent of the spermatozoa should be alive (it is normal for up to 25 per cent to be dead).
at least 30 per cent of the spermatozoa should be of normal shape and form.
at least 25 per cent of the spermatozoa should be swimming with rapid forward movement.
at least 50 per cent of the spermatozoa should be swimming forward, even if only sluggishly.
If I were you, I would start charting my cycles if you haven't already .. first day of period, when you have sex, date of ovulation (use OPKs or chart with cervical mucous, bbt, cervix position a la Toni Weschler / Fertilityfriend.com)
There are also supplements that a woman can take that are 'supposed' to be helpful in optimising conception on top of the standard pre-natal vitamins:
Baby aspirin (less than 81mg) daily throughout cycle
Vitex Agnus Castus from period to ovulation (although some theories that can be taken throughout cycle but should be stopped when pregnancy established)
Evening Primrose Oil (1500mg to 3000mg per day) from period to ovulation (do not take past ovulation)
Vitamin B6 (100mg to 200mg) most B6 supplements have a lot less so should ask specifically for this
HTH