Missed period, but a negative pregnancy test??

I have been regularly tracking my period since I first got it at about 16. Lately my average cycle day is around 23ish days. Currently I’m 19 and I’m sleeping unprotected with my boyfriend and I noticed my cycle was on day 45 (two weeks late) . Naturally I panicked and bought a pregnancy test. I’ve taken three... show more I have been regularly tracking my period since I first got it at about 16. Lately my average cycle day is around 23ish days. Currently I’m 19 and I’m sleeping unprotected with my boyfriend and I noticed my cycle was on day 45 (two weeks late) . Naturally I panicked and bought a pregnancy test. I’ve taken three since then and they are all negative. But I am really confused as to what’s going on. I am not super skinny or overweight. I’m about 130 5’2” I haven’t been under a lot of stress and I’m quite young so it couldn’t be menopause. I would go to a doctor but I don’t have insurance and I'm a pretty broke college student. Any ideas as to what might be going on???
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