Ive had sore breasts for a week now as i always do around the time of my period but i am a day late. whenever i have sex we use a condom and pullout?

If...: If you are using the pullout method this is definitely not a safe way to avoid pregnancy. Condoms are not either the best since they don't protect as much as a hormonal birth control would to avoid pregnancy( they are very useful to protect against STDs), so I would suggest to wait a couple of days and if you are usually regular and no period yet get a pregnancy test.

Late period.: Reasons for missed / late period include: an anovulatory cycle in which no egg is released, marked v or ^ in weight; eating disorder; Over-exercising (endurance athletics), stress, travel, significant illnesses, oral contraceptives & other meds, Illegal drug use, breast feeding, hormone imbalances and medical problems (i.e., PCOS). Pregnancy is #1 reason.