1 gravid, parturient, expectant, (heavy) with child, enceinte, Colloq expecting, in a family way, Brit preggers, Slang having a bun in the oven, Brit in the (pudding) club, up the spout:
Her twins are only seven months old and now she's pregnant again.
2 charged, fraught, loaded, weighty, significant, meaningful, suggestive, eloquent, expressive, pointed:
Although she said nothing, her smile was pregnant with meaning.
3 fruitful, teeming, fertile, fecund, rich, abounding, replete, productive:
My mind was so pregnant with ideas that I couldn't wait to get down to work.