help please, random bleed?

i had a random feeling the other week to take a pregnancy test so i did and i got a very very faint line (i took 3 tests that day and all were extreamly faint positives- i was freaking out) have taken more tests within the week and have gotten all negatives since... over the last few days i have been getting pain in my left shoulder like Sharp niggling pains that last for an 30mins to an hour than will fade and come back. ive been having cramps on the left side around my ovary. i didnt think much of it until this morning i had a bit of bright red-pink blood.. i dont what is going on? i googled my symptoms but all i keep getting is 'ectopic pregancy' but i dont have any pregnancy symptoms? so i dont think id be having an ectopic pregancy? (my cycles are irregular these arent normal period pains or ovulation pains for me)