I had sex 2 days ago, the condom completely split at the end without us knowing until afterwards. I've just come on my period and its really heavy. Does this mean that I'm not pregnant since its been only 2 days since we had sex?

No, you 99.9% are not pregnant if you got your period AFTER you had sex.

If you truly don't know that gettig your period most likely means you are NOT pregnant you need to educate yourself before you have sex again - Pregnancy Center - WebMD

Condoms are not 100%. What do YOU do to protect yourself from pregnancy?

Agree, "most likely" you are not pregnant I would give it more of a 95 percent chance of not being. Condoms have all types of failure. They are rated at about 10 percent failure rate. So if you do not want to get pregnant, you need to use other birth control also.

Now you have to wait to see if you get your next period.