I am 31 weeks pregnant, my husband and I had sex this morning (around 9am CST) I had some light spotting afterwards. It stopped for most of the day; now (8pm CST) I have started spotting again. Should I be concerned? I went to the dr Thursday and everything was fine

Spotting is very normal after intercourse at hour gestation. The cervix is highly vascular during pregnancy and manipulation by hand or lenient can cause spotting.