Help !

i really wanna baby ! My husband travels a lot because of work so the last time we had sex was October 1st i got my period in November Damn near skipped December it was light and a light pink color at first and lasted for 3 days now i’ve skipped January and February but all the tests say negative ! Can somebody tell me what’s going on ?? if i’m not pregnant then why has my period skipped 2 months ? or if i am pregnant why hasn’t it showed up yet ?