It doesn’t seem likely that the reason you are not becoming pregnant is that your husband's semen leaves the vagina after sex, or that his penis bends downward. In fact, sex is designed so that the majority of sperm doesn’t leak from the vagina after sex. Perhaps what you're noticing is a secretion produced from the glands in the vulva. Further, when he penetrates deeply in your vagina with his penis he probably touches your cervix. According to the duration of the period in which you've been trying to conceive without success, it seems likely that you are experiencing infertility and you should now ask for medical help. The reasons for possible sterility could originate from you, your husband, or could be attributed to both of you. Even more, a vaginal examination at your gynecologist will reveal if he touches something else (a tumor, for instance). Further, you might begin testing for possible infertility. Begin with your husband: he'll need to examine his sperm count with a specialist. If his sperm count is low, it is possible that this is the reason for the inability to conceive. Testing for a woman's infertility requires more diagnostics. You can seek advice from your gynecologist about this, and other measures for TTC (trying to conceive).