Sore for a week,which is unusual!?

good morning!, im am 24 with two young boys, after having two children my bust has disappeared from a B to a small A. I never get any changes there in my cycle,never! I am due on my period in 3days and for the past week my have been tender to touch,at first it was just with my bra on but now it is without too and my today have been prickling (to mums,that feeling when feeding and the milk is there b4 u feed) i took a test 3days ago,a cheap pound shop 25mui. Could i be pregnant and it was to early as it was neg. We bd'd a couple of days b4 ovulation which today was about 13days ago but about 10-11dpo. Would i get a positive today if i am? X