Yes, pregnancy can be achieved with a percentage of 3% normal spermatozoa, although it is likely that assisted reproduction techniques will have to be used.
Natural pregnancy with teratozoospermia (abnormal spermatozoa) can be complicated. In the most severe cases of altered sperm morphology, it is practically impossible for fertilisation and subsequent embryo development to take place.
Men with infertility due to severe teratozoospermia will have to resort to assisted reproductive techniques in order to become fathers. Although if the alteration in morphology is slight, it is not a very reliable predictive factor for achieving pregnancy, it is another parameter that must be taken into account in the clinical context of each couple and will depend on the rest of the semen parameters, the woman's age, her ovarian reserve and general state of health, among others.