trying 4th child aged 38+

Hi,
Welcome to ehealthforum,
Advanced maternal age can be a problem to get pregnant, as well as continue the pregnancy smoothly. If you have been trying for pregnancy (for more than a year) and have not been successful, you should consider getting a complete infertility work-up done for you and your partner to see if there are any underlying causes for the infertility/inability to conceive. There are many factors that govern the chances of having a successful pregnancy. Hormonal issues, problems involving ovaries and ovulation, uterine problems, tubal blocks, cervical or vaginal infections, ovarian failure/suppression etc., should be ruled out for you. Treatment as needed (based on examination findings and investigations results) would be started to help you get pregnant. Consider visiting your gynecologist/obstetrician or an infertility specialist for further evaluation and assistance and be in regular follow-up and monitoring as instructed. Have diet with foods rich in zinc content to ensure better maturation of egg and sperms. Monitor cervical mucus changes and the BBT (basal body temperature) charting to predict your ovulation and time your intercourse for having fruitful results. Have intercourse in positions that allow for deeper penetration for high deposit of semen.
Take care.