Late period 3 days. Negative pregnancy test. But had sore nipples, nausea. Last cycle was only 19 days long. Is this perimenopause?

Could be. You should re do the test in 4-5 days. Use first morning urine and follow the instructions for the test carefully. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex.