Had Unprotected(pull Out) Sex June 24, 2016, Started Spotting Brown

had unprotected(pull out) sex June 24, 2016, started spotting brown June 30, 2016 started cramping like period was coming on July 2, 2016 but started taking 7 day dose of steroids for an allergic reaction, finished steroids on July 7, 2016 period was to start July 9, 2016 but nothing. Took a HPT it was negative. Had unprotected sex(pull out) July 27, 2016, period was to start August 2, 2016 but nothing, Took another HPT it was negative, having white discharged with no order, back and hip pain and tingling/heavy breast on and off, just recently I had loose stool for 3 days,No sex in August, September period is suppose to start 19, 2016 could I be pregnant ?