My period was supposed to come today, and there is no sign of it coming. I took a pregnancy test, but I got the faintest line and I can’t tell if I’m just imagining it or what. What should I do?

My boobs have gotten bigger and my nipples have even gotten slightly darker, I’m constantly feeling nauseous and tired, I’ve noticed myself not eating as much as I used to because I’ll smell it and feel disgusted. I know those are mostly pregnancy symptoms but they also could be PMS.

Any advice?