When should I test

Raquel • Hi my name is Raquel I have a set of twins boy and girl I`m 24 turning 25 in January my husband is 38 yes I know there`s a 13 yr age difference but when it comes to love age don`t matter my twins are2
I Am 13 days p.o. and I'm 4 days late on af I have very sore breast and veiny at that to lower back pain when should I test my husband said i look pregnant but i dont know when i was pregnant with my twins I didn't even know till I was 5 months pregnant