Late and Negative... Getting Scared

Hello, I'm a little worried about my period. So, in November I missed a period and saw my doctor because I was getting negatives and he said I wasn't pregnant and all my hormones levels looked amazing... I got a period in Dec, Jan and this last one in February was so painful and SOOO light, it was like my very first period I ever got many many years ago.... now here I am 4 days late. pregnancy test is negative.... Do you think that there may be something wrong with me since my periods are acting up? I texted my doc but if I'm just being honest he doesn't seem to care and says I'm fine because of my age... I'm really starting to question my fertility since it's been so long now ttcing and my periods are getting so weird 😞I've had regular periods my whole life until this one I missed in Nov. Yes we are ttc (little over a year now) and no we do not use contraception. Any answers appreciated, thank you.