Since you have got your periods it is unlikely that you are pregnant, the symptoms you describe may be premenstrual symptoms due to hormonal changes in and around menstruation
Regarding the frequency of urination,it might be related to urinary tract infection
. I would advice you to go fro a urine analysis and then meet your doctor with the report.
Just get a pelvic ultrasound
done to rule out ectopic pregnancy
if you feel the period was very light as compared to you usual ones. Meet your doctor with the report.
Don't worry ,take care.