You should see a specialist for a complete evaluation and investigation if you wish to conceive again. Fertility
may not be an issue in your case, perhaps the timing of intercourse and hormonal imbalances may be playing a part. You should also get your tubes tested for patency. The cause of the preterm rupture of membranes
in your previous pregnancy
should be understood. Intrauterine infections and cervical incompetence
should be ruled out. With everything in order, you should be able to conceive soon. Good luck.