My test was negative

Ok so my last period was on August 22 and on the 2nd Tuesday last week I went to the ER bc I’m having a lot of cramps lower stomach the top of ur vagina I’m sorry my English not that good I get pain lol my period but worse on my right side a lot and sometimes left too . I do have a cyst small one the Er said is 16mm nothing in it looks good pee test came out negative they took blood test for my cells white cells look good idk if he took a blood test for pregnancy though ? So that’s where I’m confused I still haven’t gotten my period 14 days late and my breast hurt but he said I’m good can I still be pregnant? This never happend to me before so idk I’m going crazy the pain to much 😩