I had sex basically every day before my cycle and even on the first day of my cycle because I am on the pill and it never starts on the first day. Well I still haven't gotten a period and my boyfriend ejaculates in me almost every time we have sex... So should I get a test?

So should I get a test?
I don't see why not. Or, u just wait a week or so, to make sure it'l work if you're pregnant.

If you're only 3 days late then that's not really a big deal. A missed period can mean a lot of things. But just because you're on the pill doesn't mean you won't get pregnant. So I don't see why you don't take a test. You can try to take one now, if its negative and you still haven't got you period, wait at least a week and take another. If still negative, still late I would suggest going to your doctor and maybe having a blood test done as blood tests are more accurate than urine tests. Good luck