Condom broke while on endometriosis meds

Hello all. Sorry for the long post, but please read till the end before replying. So I've been diagnosed with endometriosis and have been put on 3 month hormonal therapy to clear it up (the hormones will basically put my ovaries to sleep so that the endometrium stops growing) and she told me to make sure i use protection during this time because its sort of dangerous to get pregnant while on the meds and the meds while they supress ovulation are in no way contraseptives. So the problem is that today (sorry if tmi) my husband had a condom on and after he came and withdrew, we realised the condom broke. Now im kinda freaking out, because i was specifically told to be careful and not get pregnant. And while im on the meds i wont even know because there are suppose to be no periods for the next 3 months. Please, any sugestions or words of wisdom? Freaking out here.