Plz help!!

I had my period on 2nd June but it was lighter than normal. Bleeding lasted for 3 days but mostly when i use the toilet. There were hardly any blood on pad. Then i had spotting for more 4 days. Now since sunday my head is spinning and I am feeling dizzy. Tested with opk for ovulation but all are negative with faint lines though its 14th of cycle. Generally I have cycle of 25-27 days. Also I have little bit pain in boobs specially on the left one. Should I go for a pregnancy test?