Thanks for your query.
Since both your blood and home tests are negative, you are certainly not pregnant.
The possibility of conception depends on the grade and severity of your endometriosis
As you have been trying for 7 years now, do not lose time further and consult an Infertility
Get your basic laboratory tests, hormonal
profiles, partner's semen analysis
Go in for a diagnostic laparoscopy
, and if possible, removal of as much endometriosis as is feasible.
There are various treatment modalities like operative laparoscopy, injections and you should now definitely opt for ART ( assisted reproductive technology ) in the form of IUI, IVF , ICSI etc.