CD 15 ?

Today I'm so nauseous and dizzy and my lower back hurts. I'm crampy and it feels like I'm gonna start my period. I have no idea what my normal cycle is like because for the past four years I have either been pregnant, breastfeeding or on birth control. After I came off depo last dec I had 2 periods that were 38 days apart and then I got pregnant. I lost my son sep 18 and got my period Nov 12. Anyways I'm just trying to figure out if what I'm feeling is normal and if I can have a period again this soon. I really feel like I'm about to start my period again!