Am I pregnant?!?!

I'm off the pill over a month ago,I haven't been taking it for long. Me and my boyfriend had unprotected sex last month using the withdrawal method on Sept 19th a little after I got my period,he did cum accidentally onto my vagina. I got my period this month but it was lighter and brown.. Shorter I think too,I haven't put much thought to it last night till past few days I've had cramps,migraines,pelvic pain and I have the flu and everytime I cough my lower belly hurts. I don't know if that could have to do with pregnancy but that's what's been going on. We just wanted to know what people though before we got a test:) Thanks!!:):)