Is It Safe To Take Steroid Injections During Pregnancy And Breastfeeding?

Hi there. I was diagnosed with costochondritis 3 years ago now. I ve been on antiinflammatories for a few years and had a steroid injection in Nov which did relieve the pain for a few months in the area injected but i probably needed several injections to cover the really sore area. I m now 19 wks pregnant and stopped taking the antiinflammatories at week 4 and the pain has worsened and spread to both sides of the sternum. Saw my consultant yesterday and he said it might be worth having a few more steroid injections if they helped last time even though theyr not recommended during pregnancy the risk is not documented to affect the baby and are probably worth it for my health. So i can book in to have these injections at any time between now and the end of my pregnancy or once the baby is born if id prefer to wait. I m just unsure as everyone else in the medical profession says no to to these during pregnancy i really want a second opinion, what is the real risk to the baby if i do have them and if i decide to hold off til once the baby is born can i have the injections if I am breastfeeding? Thank you for your help.