My period is 30 days late. I took 3 home pregnancy test all came back negative. Back pain,be feeling like throwing up and don't and be eating a lot more. My period is usually on Time can I be pregnant??

Assuming you have had sex, then yes.

Then why did 3 pregnancy test come back negative and I don't have sore Brest?

Why?

#1 Test possibly taken improperly or at wrong time. (you did do this right after you wake up and only the first time you pee that morning)

#2 You might be one of the women who just won't get a positive until the second trimester.

#3 Something else unrelated has caused you to skip a period (stress, medical reasons, medication, or it just happened among other reasons)

30 days late, is good enough reason to see a doctor.

Why no sore breasts? Not every pregnancy is the same, no two women have the same symptoms during pregnancy.

For example, my first pregnancy I had no nausea, missed period, tested positive, but other than that I wouldn't have known I was pregnant as I had no other symptoms the entire pregnancy.

My second pregnancy I missed my period, tested positive, and I was sick the entire 9 month.

Third pregnancy no issues other than a missed period, no nausea, no sore breasts, only a missed period.

Every pregnancy is different even for the same woman.

How did you test? If you took an at home urine test did you use first morning urine? Did you follow the directions?

Have you seen a doctor for a blood test? At a month late that would be the next step.

Wish we could diagnose pregnancy online, but there's no way to get urine or blood online, so there's no way to give you an answer online.

Good luck.