Period or implantation bleeding?

I've had irregular periods for about 5 years now, i went over a year without one and then finally started back march 22-23 and it lasted about week ending on the night of the 29th but it was very light and off and on the whole time then that following friday i started it again lasted until sunday morning it was mostly just spotting very light pink. I now have very bad stomach cramps nausea and i have been very tired for the past 2 days. eating seems to help with the nausea a little bit but thats the only thing that has. someone told me that it might not have been a period it could have been implantation bleeding since it was very light and spotty, my husband and i have been trying to conceive for over a year with no luck since i haven't had normal periods