hi in 3rd preg in 12 months my period was due yest been doin tests all week some neg/pos i thought by now id get def pos and the more a pregnancy grows the darker the test after experience last year with chemical with tests not getting darker , did internet cheap ,first response early result and clear blue dig all with same sample internet cheap noting not even an evap , first response hardly hardly anything clearblue dig pregnant 1-2 weeks so i guess im pregnant but should nt these tests get darker i did one monday 10dpo faint pink line used them nearly everyday and nothing now any ideas please ?