Help!

This is my second month on the pill. A couple days before starting my inactive pills I began spotting with cramps. Similar to what my period would have felt like when I wasn't on the pill except for no blood. So I spotted for a couple days before starting the inactive and than continued to spot while on the inactive for almost the whole 7 days. Is this normal? I understand it takes time for the body to adjust and that on the pill it's withdrawal bleeding but because I didn't have any actual blood it kinda makes me nervous about being pregnant. Any advice?