Hi,
Welcome to the forum. I am really glad to help you out. Constipation is very commonly found in pregnancy. Be careful to consume regular meals, take in dietary fiber, and a regular sleep will produce feces of the right hardness(about as hard as a toothpaste).
If constipation continues despite these efforts, please consult a gynecologist as laxatives may be needed. Straining when passing faeces in constipation can cause preterm labor pains and development of anal fissures or anal tears. I sincerely hope this information helps. Take care.