Spotting at 5 weeks

Hi Ladies! This is my first pregnancy and I'm currently 5 weeks +4. I've been dealing with longer than normal cycles for the past 6 months or so, usually around 40-45 days. I spotted for 5 days about 2 weeks ago and then stopped. Now I've been spotting again since last Monday so md did a blood test and confirmed I am infact pregnant, however my levels were low and she automatically assumed chemical. Well almost 2 weeks later the levels keep increasing and 2 days ago she was "very happy"'with my result but I'm still spotting! About once a day as well I end up with some on my panty liner instead of just when I wipe. Any bleeding/spotting success stories and could this just be the extra build up from my long cycles shedding?!