Early Pregnancy Symptoms.
Some women may "feel" pregnant before a pregnancy test will be positive, while others may have no symptoms or may feel like their period is coming. It can be different for each woman and can also be different for each individual pregnancy.
Some common early pregnancy symptoms are:
Feeling nauseated
Implantation spotting/bleeding. (A very light bleed or spotting around 6-10dpo)
Frequent urination
Increased appetite
Hot flushes
An increase in cervical fuid
Tender breasts
Lethargic
Backache
Sensitive smell
Constipation
Irritability
High temperatures past your typical luteal phase length
Note that some of these symptoms can also be associated with symptoms felt when menstruation is approaching. The only true way to detect a pregnancy is to get a positive pregnancy test.