Not sure what is going on or how to feel...

I try coming here for advice or just some other opinions, I never really have any luck but I’m still going give it a try.

My boyfriend and I have been trying for 5 years, back in 2016 I was diagnosed with pcos so that definitely made things harder for us.

I had a period that started August 10-5 I usually have irregular periods so the last period before then was in April 9-22. However, this last period was very different for me. My breast hurt and I had more cramping ( usual for most but not for me, I never have sore boobs and don’t really have such strong cramps during my periods) it ended and my sore boobs went away until about a week ago.. they are back ( sore enough for it to hurt to put on my bra).

I went to the doctor two days ago and they did a pregnancy test and it was negative they even did a blood test and said it was negative..💔 obviously that was devastating but I accepted it because I’m used to getting negatives by now...

but something is just odd to me. I feel different and can tell something is off my breast are still sore and today I started having lower back pain and on and off cramping plus I’m nauseous...

My period isn’t due for 5 days but given they tested and got a negative I don’t want to keep on believing it could finally be it to just let myself down.. But like k said I can’t shake this feeling... does anyone know what could be going on. My doctor isn’t really giving me any answers so this is really irritating not knowing what is going on.