Hi and thanks for the query,
from what you describe, if you suspect that the condom broke then it is worth worrying. However, considering the fact that you have a 29 day cycle and this is the 29th day, its a bit too early. A you feeling any signs and symptoms you usually experience before menses.
Having taken emergency contraception
35 hours after sexual intercourse, the efficacy i still relatively high, as much as 70 %. Its really too early to get worried although there is a small possibility of getting pregnant.
I suggest you stay calm for a few more days and if you do not see the menses i say 2 weeks time maximum, it would be appropriate for you to do a pregnancy
test. But chances for you getting pregnant under such circumstances are actually very small.
Thanks and best regards,