7days ago i was in a spa with my bf. We where in a jacuzzi (water lower than 34 degrees) (no chlorine or soap) and had dry sex in the water.. He fully came while i was sitting on his d*** ... We both had bottoms on ( bikini bottom and shorts) now i am a week before my menstruation and my lower back hurst and i have some cramps .. Can i be pregnant .. I have no boob pain or dizzyness , morning sickness or vomitting ...iam freaking out and scared can someone help me?