Period 21 days late!!

Okay my last period ended on July 19,2015 and the next week was empty but on my ovalation week me and my boyfriend had sex all that week and then the next following week on the 4 day I started spotting very light pink and it lasted for 3 days and since then I haven't had my period and I am 21 days late so that mean I am pregant and so far I had all the symptoms expect throwing up