TTC do u think im finally pregnant?

Well my lmp was on dec 19 and all the O calc said i O on the 4 we did the BD the 2 through the 7..If we did make a baby i would be 4 weeks today right? anyways well i dont feel any different i get a slight cramp sometimes and and i feel bloated my are a little sore (not my ) just the to the touch..and at 9 dpo i had spotting.COuld it have been imp bleeding.AF wasnt due for a week when that happened.I am now 12 dpo.should i be experiencing anything else? could i be preg? If so if i were to test say tomorrow (sunday) could i test at night? or is it better to test in the morning this early? i have the tests that u can use 5 days before ur missed period..ai dont want him to be there when i test and ill get home before him sunday night...(gonna suprise him :)) so in general by what ive told u what do u guys think? AF is due tuesday...Thanks for everyones help and **baby dust** to all TTC!