I’m not sure

Going on four days I’m late for my period.. I’ve been late by a day before but I’ve never gone this long .. I’m not sure what to think.. I’m having all the symptoms of pms or pregnancy related but nothing is there.. I’ve even tried to force my urine to see if any blood would come and nothing.. just discharge. Don’t know what to think right now. I was taking antibiotic for bacterial vaginosis for 7 days.. and I looked it up if it can affect your period and it clearly said “no it shouldn’t affect your period” so I’m like .. ok um .. I’ve never wanted my period so bad until reality just hit me. What if I’m actually pregnant. I mean I’m financially stable, have a job, and a car, insurance, benefits and working on an apartment and I’m positive the father would be in the babies life but I’m still not so ready at this moment as it’s a big responsibility. I’m almost 20. But I guess I’ll see how things go if maybe it’s the antibiotics or not