If you had given me further details bout yourselves it would have been very easy to answer, you have not mentioned about your age, if you are married or not?, lot of possibilities can be there from your symptoms, one such thing is PMS-pre menstrual symptoms. And having unprotected sex without intending for any child is a road to disaster, so kindly use some contraception
, best will be a Condom, which will protect you from getting ant STDS. Kindly get back to me with further details , so that I can answer your question in detail.
Thank you for asking question. Sincerely