I Think Am Pregnant I Have Traamps In My Tummy

I think am pregnant i have traamps in my tummy and I have back pains I feel smthing in my tummy but I have my period my blood is black brown pinkish colour I buy pregnant test many times it say's am not and am getting fet and I tried detol I take my urine and put little bit of detol it end up milky first and then change like oil and water