Been having irregular spotting round expect period last regular period was june 8,2015 been having light spotting since prey test neg could i be preg?

Unlikely: Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after getting a "weird" period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon.