As your period occur in every 2-3 weeks known as poly menorrhoea and prolonged bleeding for 8-10 days known as menorrhagia
1.Poly menorrhoea occurs either due to shortening of follicular/ luteal phase or due to anovulatory cycle
2. Menorrhagia occurs either due to blood coagulation disorder/ stress related/ any underlying gynaecological disorders like PID, DUB, Fibroid, Adenomyosis
So, do not try to neglect the condition and consult a gynaecologist. You should undergo through some investigations like total blood count to know about anaemia, CT& PT for coagulation disorder, abdominal USG, PAP smear
You can take NSAIDs for pain control, tranexamic acid
for control of bleeding and for further treatment follow the instruction of your doctor.
Take care, bye.