Concerned

I took 2 pregnancy tests, and they both came out with faint lines me and my bf was confused on that knowing if it was an accurate positive. And now when that happened from Monday to today, I started having some cramps which we're both are really confused on what it could me on if its menstrual or implantation bleeding because my period is not that heavy?!?!?need help from anyone I would really appreciate it!! From moms of 4 or currently pregnant with 4th baby. I thank you for it.