A condom may break during intercourse or other sexual activity; if it's not worn correctly; has surpassed the expiration date; is not your size; or is used with an oil-based lubricant.
Bad news is that a broken condom is as bad as using no condom at all, as it might lead to undesired pregnancy, or transmission of STIs.
Is it okay to do it during periods?
It is perfectly normal to engage in sexual activity during periods, but there are certain risk factors and important considerations.
Notably, just like any other time, you're at risk for STIs and pregnancy. So, make sure to use protection.
Also, since sex during periods can get a little messy, you should keep a towel or wet-wipes handy, or take a shower after the deed.
What if you end up having unprotected sex?
By having unprotected sex, you put yourself at risk of getting pregnant, or even worse, acquiring a Sexually transmitted infection.
So, to be on the safe end: 1) Arrange for a contraception, as soon as possible. Emergency contraceptive pills are often recommended to be taken within 72 hours of having unprotected sex.
2) After a couple of weeks, get tested for STIs and pregnancy.
Above all, just have fun
At the end of the day, remember that sex is no competition, with anyone. As long as you and your partner are happy with what you're doing in bed, that's all what matters. So, be playful and try new things. Above all, just have fun!