Can i be pregnant or is it just my hormones???

Good evening...I have a long story... I had the inplant but it did not work for me so they took it out in feb 2017... they put me on the pill i got my period on the white pill and it stops at the red pill they took me off the pill Mar 2017 from then till now im not using anyting.. suddenly i feel sick nausea, headache, crams, get strange cravings, go to the toilet more often, feeling tired all the time sometime even fall asleep at work, feeling dizzy have mood swings (sing songs and then start to cray for nothing at all, fighting with my husband for nothing) im not like that... in may 2017my period was late for 10 days and only last 2days were normaly it is 6 to 7 days... from mar 2017 i was holding track of my period and cycle... i already have done 5 pregnancy test all of them was negative.. please help wat can it be.. ??