Question

So I haven’t had my period since the end of August which is normal for me because my periods are irregular. The past two weeks I have noticed sharp pains in my lower abdomen, first on my right side and sometimes my left side it’s not consistent but been happening often. I haven’t felt like myself lately some Nausea and I feel really tired lately. I haven’t taken a pregnancy test because every time I miss a period I feel like there is a chance I could be pregnant and it always comes up negative. I have a year and half year old daughter and me and fiancé haven’t been using protection since we had her. Have any of you experienced this in early pregnancy? My last pregnancy I had very bad morning sickness for the first three months.