Wait for a missed period, then take a pregnancy test.

http://pregnancy.about.com/od/pregnancycal endar/p/week4.htm there are so many questions answered here and it shows signs starting from ovulation to birth day. It's really useful

hey guys just to give you an update, I had attended my doc last week who assumed pains were just constipation and said too soon to test for pregnancy. I have continued to get these bad cramps mainly at left side, and lower back ache, plus feelin nauseated.
I took a test this morn and it was POSITIVE!!
I attended my doc,and he said the pains might just be everythin stretching and moving for baby to grow or just constipation. something I have never suffered from before, but anyway I am scared of miscarriage or ectopic. Doc has arranged for a scan in 3 days time to see exactly what is going on, and if I have any more pains that are severe or bleeding to go to ER.
fingers crossed this wee one is in right place and stays put!

i had the exact same symptoms a week before my period was due and guess what im currently 28 weeks pregnant good luck