Low hcg levels and tested possitive for chlamydia. Is it ectopic?

my last NORMAL period was oct. 12, 2009. on November 15, 2009I had what I thought was breakthrough bleeding that lasted 4 days (probably just a period). I found out I was pregnant on Dec. 10, 2009 ( about 3 weeks ago) When I went to the OB Gyn on December 21 (2 weeks ago), the OB did a pap and a sonogram.
At the time, I thought I was about 8 weeks pregnant, but the OB said that I was only about 5 weeks because the sonogram showed only a small sac. This was no suprise because we concluded that the bleeding on Nov. 15 was indeed a period. Just to make sure, she looked at my ovaries and Fallopian tubes. Both looked normal. She took bloodwork aswell to test the HCG levels. She suggested that I come back in 48 hours to see if my hcg and progesterone levels were rising.
I got a call yesterday (Dec.31) saying that I tested possitive for chlamydia and that the OB was concerned with my hcg levels. They want me to come in on Monday (Jan. 4,) for a sonogram and/or more bloodwork.
I immediately went to the pharmacy and got the medication ( 2 large pills) and took it last night.
( My partner and I are abstaining from sexual activity until he is treated as well.)
I know that Chlamydia can lead to ectopic pregnancy and the doctor was concerned with hcg levels.
I haven't had any bleeding or other symptoms of ectopic pregnancy, so I still believe that things are ok.
Has anyone ever had low Hcg/ progesterone levels and the baby been healthy/ not healthy/ ectopic?
Has anyone had chlamydia while pregnant or at all?
I am staying confident and trusting in god that our baby is completely healthy and growing in my uterus.
I really need to talk to someone about all of this.
If anyone has anything helpful to say, please do.
Thank you
ps.. This baby was planned and is very loved so I am really hoping for the best. Please pray for us.