Period help

Hi ladies,

So I had sex twice November 16th once with a condom and once without. I’m on birth control and have been for 2 years and I take it right. I got my period in November. Now fast forwards to this month. My period just started on Monday- ish and it came a little later and it seems to be a little different from normal. Wednesday and I bled very heavy earlier and now it just disappeared. I’ve taken sooo many pregnancy tests before it started and they are all negative so I’m not concerned about that. I’ve been extremely stressed out and nervous due to family things and stuff. I stopped smoking too. I also started antibiotics on Friday for swollen lymph nodes. Do you guys think I’m just stressed out. Also I’ve been researching, I went to the doctor for my lymph nodes, and I have an appointment for the OBGYN on January. Also I’m not even 19 yet so I’m kinda confused and nervous. Please please please help me.