can i still get pregneat even if my period is irregular? im

hi..i just wanted 2 know if its possible for me 2 get pregneat because ever since the first time i got my first period i never have it every month..i usually have it on different months..the longest has been 5months without having my period..im just worried because me and my boyfriend have had unprotected sex many times n lately i've been feeling all the symptoms of pregnancy and i dont know if i can be pregneat or not because i dont know when my next period will come so im very confused..what should i do?? should i take a pregnancy test because i dont think i need it but then again i feel weird and i feel that something isn't right..please help me!! :-(

thank you!!!!!!!

love...
M.W