could i possibly be pregnant?

Ok well on the day i was suppose to start my period i spotted…and spotted for 2 days…a week before me and my bf were fooling around but we didnt have intercourse…we tried to be really careful not to get sperm near my vaginal area…well after the two days of spotting it stopped completely…before that i didnt have any premenstrual symptoms like i normall do…but after the spotting i started to get all the premenstrual symptoms like slight cramping back pain headache and breast tenderness…now i am on my 37th day of my cycle and my body still feels like my period is coming but its not here…is there a possible slight chance i could be pregnant or is my body just outta wack?