After your first coitus, it is normal to experience stomach and back pain because of the painful spasms of the muscles around the vagina called as Vaginismus. It is also possible that your boyfriend might have bumped into your cervix and bruised it. Another most common cause could be your anxiety and stress as you had sex for the first time.
There are number of useful homoeopathic medicines which can help you in this situation and can be prescribed after knowing your detailed symptomatology.
Next Steps
you can easily take an online consultation for further treatment guidance
Health Tips
take rest and drink plenty of water