worried

ok guys.. a little background

we got pregnant last year in November. I peed on a stick like the day before my period and got a faint blue line. unfortunately I ended up misscarrying the next month. so NOW I find out yesterday I'm pregnant again!! peed on a stick when I got home from work (and about 5 days before my missed period) and got a dark pine line. yay right?! well I'm up again and of course I pee on a other stick. this time the line is a little lighter but definitely still there. should I be worried?! Im so nervous about losing another baby!!! also I know that last time I didn't get to see my doctor until 8 weeks (which was when we also found out the baby stopped growing at 6 weeks) and they did blood work to watch my levels go down. should I ask them or can I ask them to start doing blood work in the meantime to monitor my levels so I don't have horrific heartbreaking repeat of last time?? haaalllppp!!!!!