I had my u/s last Thursday because of spotting and found out I was having twins and he's keeping a close eye on my HCG levels too. I had them drawn this past Tues. and again this morning before my other u/s. Didn't find out what today's was but my levels for Tues. was 250,000! Eeeeeek! So at first my u/s didn't go so hot, we only saw one twin, but then after a lot of looking and switching the u/s to the heat seeking mode, Dr. finally found the baby and was able to see the heartbeat, they're both measuring almost 8 weeks and heartbeats are 146 and 151.