Hello Ladies I Need HELP!!!

My period is Always normal so usually before I get my period my nipples start hurting a week before my cycle starts well the month of January instead of my nipples hurting both of my breast was hurting instead. I knew it wasn't lack of water because I was only drinking water at the time. Okay so my cycle started 1/4-1/8 then I was suppose to come on 1/30-2/3, but I didn't come on until 2/1-2/5 so I was two days late and I had the worst period in my life. I was heavy and cramping extremely bad that cycle. Then this go around i was suppose to come on 2/28-3/5 and this time my nipples was hurting like they normally do before my cycle starts. Well I didn't come on until 3/5 and suppose to come off 3/9 and this period is heavy, but the cramps I can handle. I'm always on time with my period or a day or two early. My ʆɩaŋcé kept telling me to take a pregnancy tҽىt, but I didn't take one cause I hate the disappointment when the test doesn't say positive. Do you all think my cycle was just changing or I could be pregnant and still getting a pҽɾɩɷɖ?