Faint lines

Alejandra

I tested yesterday and got faint lines on both pregnancy test, I went in for a blood test today and it also came out faint, they told me my HCG levels could be low still to try again in a week or so. But... I started bleeding yesterday, like period blood but no cramping nor pain. I don't know if I am having a miscarriage or it's just my period because with my first born I did have a period and new I was 3 months pregnant with him. What do I do? Please help me