you can take a pregnancy test when/if you miss your period. If you dont know how long your cycle is, you cant say when you ovulated as calendars work of a 28 day cycle and yours could be longer than that. implantation bleeding can vary from a few spots, just a smudge when you wipe, or a very light flow. Your breasts could be sore or achey, but sympotms arent likely until you have missed your period.
Good luck.

you should start reading up on some physiology. But please you must be more careful. Note that there are laws in place to protect you with respect to patient confidentiality; once you know you have missed a cycle I would suggest seeing your doctor. The pregnancy test you get from the drug store is almost identical to the pregnancy test you will have done at the doctor's office. Of course they can do more sophisticated tests at the office though.

when do the sympotms usually happen? im suppose to start my period sometime this week and i saw some brownish spots on my underwear does that mean anything?