Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
The source of bleeding after sex is usually the
cervix — the narrow, lower end of the
uterus. Even with a completely healthy cervix enough friction, lack of lubrication or mild trauma during sexual intercourse can cause some bleeding.
So you should use water-based lubricants during sex.They are easily available in market. You can also communicate with your partner to be gentle during sex. Lack of foreplay also decreases natural lubrication of vagina. so you should not rush into sex.
Inflammation of the cervix or some other abnormality, most of which are harmless, can also result in bleeding
If problem persist, visit a gynaecologist
Don't worry you would be fine
Hoping your query is solved.