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It is illegal for your employer to discriminate because of your pregnancy. See link: http://www.dfeh.ca.gov/Publications_StatLaws_PregDiscr.htm
and you would report it to the EEOC after you spoke to HR first. Maybe it can be dealt with internally before it becomes a bigger issue. If HR doesn't put a stop to it then you can go the EEOC route. see link: https://www.eeoc.gov/laws/types/pregnancy.cfm
The documentation of your aggressiveness and subpar performance better be good or there could be a claim of discrimination based on your pregnancy. Document (even if only in a written diary) anything that happens as it relates to discrimination and your pregnancy.
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