Thanks for your question.
I suggest you should have a pregnancy
test as soon as possible as you may have conceived during your last cycle. You should also have a trans-vaginal ultrasound
to find out the cause of your abnormal bleeding pattern. This may be a sign of a local pelvic pathology, hormonal
imbalance, or an ongoing pregnancy complication.
It is unwise to have sex during periods as chances of infection is increased. You may acquire a STI more easily during this period. It is better to use barrier protection to decrease chances of infection.
Hope this clears your query.