Need advice please... .. . .. ...

On the 17 of January I had intercourse with my partner and he pull out kinda late and finished still outside. And the next day I begin with my period! I began feeling weird stuff with myself. ( I have nausea/vomiting, my head hurt a lot, I feel bloated, breast are tender, really fatige, light cramps, dizzy and been going to the restroom more often).

Should I be worried or not? Is it a good chance of me been pregnant? Or not yet...