miscarriage 2 weeks ago, no dc. but getting sever cramps

Hi,
Welcome to ehealthforum,
The symptoms could be due to probable ovulation, orgasm related uterine contractions, PID, pelvic adhesions, endometriosis implants, etc. It is difficult to comment on the cause for the symptoms that you describe without examining you. You should have considered waiting to have your first periods as well as give break of about 4 weeks for internal healing. If you have been sexually active without protection, chances of repeat pregnancy are also possible. Visit your doctor/gynecologist for further evaluation if you do not get your periods within 10 days from expected period dates, or if you develop any other new symptoms. If pregnancy gets ruled out, further evaluation would be done to look for the underlying cause for your absent periods. Treatment as appropriate (based on examination findings and investigations results) would be started to help you get your periods and regulate your periods. If you are not ready for pregnancy, but intend to remain sexually active, you should consider getting started on suitable regular birth control measures to be protected (after your periods). Avoid unprotected sexual contact within 2-3 weeks of getting started on hormonal contraceptive (as most of the hormonal contraceptives start giving you effective protection after 2-3 weeks). Be regular with birth control use as instructed. Avoid having unprotected sexual contact if you are not ready for pregnancy. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Take adequate rest. Drink plenty of water. Maintain healthy diet.
Take care.