Hi,
Thanks for writing to HCM.
Sadly medicine has not come up with such drugs which have dramatic effects on 
sperm count and motility.  Multi vitamin with zinc combination drugs are used with some improvement.
No drug give 100% results and also it takes long time to improve. So chances of your counts to increase are average and depends on existing count. 
I would suggest to repeat 
semen analysis after 3 months . If counts have improved then your chances of natural 
pregnancy are more.
I would suggest that you rule out 
varicocele in you by a doctor. If it is there, get it operated.  And do some life style modifications like -
-     Reduce weight, do exercise.
-     Stop smoking and alcohol. 
-     Avoid caffeine.
-     Ware loose under garments.
-     Healthy diet with 
multivitamin and zinc.
-     Avoid trauma to testis.
If no improvement is there  then better to go for IUI. It is intrauterine deposition of sperms. Here healthy sperms are selected and placed inside the uterus.  You can try 4 to 5 cycles of IUI before proceeding to IVF.
Hope I have been helpful.
Regards     
Dr. Ashish Verma