opinions?? help please

Okay so I'm on BC and I forgot to take 3 pills of the first week after my period which was on 01/01/17-01/02/17 my period lasted two days (which is weird it usually lasts 4+) I did have unprotected sex twice that week (before period and after) it's the 12 day after my period and I've been I having some symptoms like nausea, craving certain foods, feeling extra tired, slight cramps in the lower abdomen, lower back pain, frequently urinating and constipation, can't lay on my belly either and I know its too early test because my next period is in 19 days... help? Anyone??