I got these two from Amazon and wore them at 24 weeks, I think they’d both have been cute a few weeks earlier.

CUPSHE Women Swimsuit Maternity... https://www.amazon.com/dp/B0B3DHMKQG?ref=ppx_pop_mob_ap_share

GINKANA Maternity Bikini Set Two... https://www.amazon.com/dp/B094J6GG2T?ref=ppx_pop_mob_ap_share