i would say it is hun yeaa, just because i started looking at bras around 5wk post op and it got about 8/10wk post op and they wouldnt fit right. u will have so much swelling and they just change shape so much everyday. if your looking at just triangle bikinis i would say they would be ok, but if your thinking the more supported ones with wire and a proper cup id wait as long as poss, or around 4weeks they will have softened a lot you would probably get a better fit xx