I took four tokes of weed does that come out in the system? if yes for how long?

Can be days: Since you're not a regular user, you're likely to be free of the stuff after four or five days. This isn't the place to debate the wisdom of the laws, or to note that there's stuff that we don't know. I notice you're pregnant. Maybe you want to save further experimenting (if any) until junior arrives. Being a mom is a responsibility ; that includes not losing your job for smoking weed.