Normally lochial discharge will be there after delivery for 3 to 4 weeks. If will be reddish(lochia rubra) in first 1 week, serosanguenous(lochia serosa) in the next week, whitish in color(lochia alba) in next 1 to 2 weeks.
As in your case you underwent cesarean section with no baby, so the chances of passage of blood for little longer period is common. Because if you had baby and breast feeding her it will help in involution of uterus
, which will lead to decreased exposed raw area and decreased blood flow. You can wait for some more time and your bleeding will subside soon.
But if you are experiencing continuous excessive flow better to underwent checkup because it will indicate remaining bits of conception products inside the uterus or any infection inside the uterus.
You can have contact with your husband after 6 weeks of your surgery date. Better to avoid pregnancy
for 1 year after cesarean section because early pregnancy can lead to scar dehiscence.
During first few months of pregnancy better to use contraceptive
methods as periods will be irregular during that time. Once your periods become regular you can have contact in days "other than" 8th 10 20th days of your cycle. Means during first 8 days and then during last 10 days of your menstrual cycle are your safe days(if you are having 28 to 30 days cycle).