Confused

So I was suppose to have my period on Friday March 1st. It never came so in that Tuesday I took a pregnancy test and it came out faint but positive . On the 8th I ended up having a period for 4 days and then nothing . So I assumed maybe it was a mess up . Then Monday the 18th I was light bleeding for not long at all which ended in brown blood and then today on the 20th spotting . I’m not sure what this means and what’s going on? Or if I should make an appointment ? Super confused soo please help if you have any advice . ( been trying to get pregnant for 4 months now as well )