2 months with no period

Hi everyone, so I am on day 56 of my cycle but for the past 2/3week I was terrified that I was pregnant (a little back story I have two girl 3 and 1 I had hyperemesis and c-section with both my second was born at 23 weeks (see last post) for many complications I can get pregnant but it with all my complications my doctor has said if I get pregnant again there is no guarantee at we will both make it) I have been taking test 3/4 times a week and they are 100% negative no mater how hard you there is no line but I have been cramping for weeks and my boobs hurt so much even if some just hugs me they feel like rocks and I live in Texas so I am limited to my options if I am I am just terrified and don’t know what to do my period is kinds irregular but for the most part I start between day 38-50 but I’ve never gone this long without a period and not been pregnant.