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Inadequate erections are not indicating physical weakness of an individual. It is not indicating either impotence
or nervous disorder.
Hard erections can occur due to the maximum elicitation and stimulation one gets through his partner by seeing, touching, hugging and through foreplay. If his mind got disturbed by some ideas like depression
, inadequacy, (even due to not able to impregnate his partner), or due to wrong advice by the obstetrician to have sex daily during the fertile period etc. he may not be able to get stimulated by her partner to the maximum extent and he may not be able to get full erection.
If he consults a sexologist
and have a counselling
and also with some drugs he will be alright.
To get pregnant, the seminal parameters should be adequate and it is not having any direct relation to inadequate erection.
Your treating physician will take care of the same.