Solars I feel sorry for you having to continue using the bullets for so long. My clinic told me that my placenta took over from 12 weeks so I could wean off them from then. Think I took my last one about 14 weeks. Trix is right it doesn't seem that long looking back.
Trix yes I am just a couple of weeks ahead of you at 18 weeks exactly today.
I can't remember who was talking about tiredness. I don't think I had it too bad but just remember all a sudden feeling normal again. I think I was about 13/14 weeks at that point. Just take it easy and eat as well as you can, plenty of meat, chicken & eggs and make sure you get your 5 a day. I was also told to drink orange juice with my meals to help iron absorption. It cannot do any harm and remember my iron levels were highest mw had ever seen so obviously working for me. Jyst keep in your mind that you are making a whole new person from scratch, it is bound to take it out of you.