anyone can help

Anyone know how stress affects the baby. I'm 31 weeks and I've had a very stressful pregnancy. To the point I haven't really been able to enjoy it. With my husband cheating and leaving. To raising our 11 month old and my 8 year old. Dealing with negative left n right. To say I'm under stress is a high understatement. I'm just getting concerned now because this is the first time I've been able to sit breathe n think