"Period" same day of confirmed pregnancy

Today I had my pregnancy confirmed at my Drs office. 4 weeks 4 days, due 7-07-18. However I started spotting this morning and have been bleeding lightly all day along with mild cramps. I had blood drawn and the nurse practitioner said not to worry about it just yet since it can be normal but I'm very uncomfortable with this because I just had a miscarriage in July. Its horrifying to think I'm going to lose two pregnancies in a row. I'm wondering if anyone has experienced anything similar and still had healthy pregnancy? thanks in advance for your replies..