i need some reassurance

Bel
so my boyfriend and i have unprotected sex a lot and sometimes he cums inside. i've been taking my birth control around the same time for the past year or so and i skipped a period and went to the next pack this past week. on new years my boyfriend came inside. i've been changing antidepressant medications and i'm not sure if my intense nausea could be due to me worrying, the medicine, or if i could actually be pregnant. anyone have any useful comments to make me feel more at ease? (please, i'm really panicking)