I am 3 days late and I am always about a week early to get my period. I took a prg test and it read negative. I have a lot of cramping and sore breast but I also get those symptoms when I'm about to get my period that's why I'm so confused... what should I do? Is it still too soon for the pregnancy test?

Way too soon for a pregnancy test... you should be at least 14 days late before you take one.. first thing in the morning.. the first time you pee that morning.

In 11 days you will be able if your period doesn't come before then.

3 days late isn't really very late. Most women will be later than that from time to time.