it was our first time at 14, I feel emotionally disturbed.

Hi,
Welcome to ehealthforum,
If you are not ready for pregnancy, have orthodox family beliefs, have fear of STD, have fear or lack of committed relationship, etc, you can have guilt feeling and emotional changes (seen commonly in women). If you did not use protection and if you were sexually active during your fertile days, chances of pregnancy are possible. Wait and watch for your next periods. If the symptoms persist, visit your doctor for further evaluation and assistance.
If pregnancy gets ruled out, and if you are not ready for pregnancy, but intend to remain sexually active, you should consider visiting your gynecologist to get started on suitable regular birth control measures to be protected (after your periods) as well as regulate your periods. Be regular with birth control use as instructed. Avoid having unprotected sexual contact. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet.
Take care.