Worried could I be prego ?!?!

I weighed 130 and went down to 104 in a month, I then missed my period (well what I thought ) my period was the latest it’s ever been . It started at the end of this month and is VERY LIGHT . Before my period I got really sick , morning sickness , headaches , backaches , cravings , I took a test it said negative but my period only last pretty much ONE day . Is there a possibility I can be pregnant ?! I thought I was getting sick from the crazy weight I lost (which was caused from I have no idea ) but I’m worried I can still be pregnant ??