Trying to get pregnant

Im new to this my app said I was due on the 18th I havent had a period or nothing yet i have had the pains. I had my implant removed August 2018 and December and Jan my period we quite regular December was 26th and Jan was the 23rd. I'm not sure what to do is it worth doing a pregnancy test or should I wait till the end of the month? I had really bad like period pains yesterday I went all got and sweaty and felt weak so say down and not long after it passed. I had like period pains this morning but still nothing.