Thank you for posting your questions here, I will try to answer them to the best of my abilities.
Well there being blood after sex happens to a lot of women, but blood clots
, is something to worry about. It is possible that she had conceived and then had a miscarriage
and that is why there are blood clots, they could also be there because of an ectopic pregnancy
In any case, I highly recommend you take her to a doctor, preferably an obs and gynae specialist as soon as possible, they can do an ultrasound
and find out what exactly is wrong with her.
I hope this answered your question.