Welcome to HCM,
You can get pregnant, as in your case only one fallopian tube
is blocked. Each month ovulation takes place from alternate ovary. Early test for pregnancy
can be false negative. You should use Ovulation Prediction
Kit to find out date of ovulation, and have sexual relation on ovulation day & for a few days thereafter only. Your husband should also get his semen examined. Clomifen stimulates ovulation, thus increase chances of pregnancy. Continue treatment for a couple of months & have faith in treating Doctor.
Wish you good health & early conception,