Unwanted pregnancy. Will be pregnant?

Sir/mam My gf and I have sex in December 21..and after 21 hours she takes unwanted 72..After 7 days she have a period like bleeding and it lasts 5 days..after that the next period did not come next month..we are test pregnancy with urine pregnancy test 7 times..but every time test result come negetive..after that we are sex in 18 January with protection..And later 29 January we are sex again but this time it was anal sex..but for safety she was taken unwanted 72 between 1 hour and after 7 days she was have periods like bleeding..and it lasts for 6 days..and it's normal periods like flow..so sir/mam what is that? It was withdrawal bleeding or implantation bleeding? And after that today my gf have some lower abdomen pain..first this pain starts tomorrow and this pain occur in left side..but today it's in middle lower abdomen pain..can a girl pregnant if she have withdrawal bleeding? And what is the pain? what is the chance of pregnancy? Iam very tensed..can she will be pregnant?