Hi sir, Welcome to health care magic, I can certainly understand your concern about your sexual problem and having a baby, as you said that you had a very good sexual life once in the beginning but now because of pressure of having a baby you may be stressed out. I would like to suggest you to be relaxed and perform some breathing exercises and try not to worry too much about pregnancy, share your mutual sexual fantasies so that ultimately it can get succeeded I can suggest you to practice Master and Johnson technique ie your partner has to squeeze the skin of your penis forward just before ejaculation, this is very effective method , but takes some time to get perfection, so be patient and practice this method for good results . if still you find problem with erection, you can start medications like sildenafil, for good erection please post your further questions if any Thank you.