Tasha...
First thing..dont freak out. If you are really unsure, dont start the clomid until after you have spoken to your fs tomorrow. One day will not make a scrap of difference. I usually take it day 4-8. The first time I took it I started day 8-12 (that was the day I got the first prescription). My FS said it didnt matter one iota.
With regards to the endometrium lining, you are correct in saying it needs to be a certain thickness to support a pregnancy, but your FS will measure the thickness when you go for a follicle scan (approx day 14). If there is a problem, there are ways to treat it so it thickens.
The clomid will change your cycle. It may lengthen it. It may shorten it. Your periods may be heavy one month, lighter the next. One thing I have learnt is the taking of clomid is not an exact science. It is guesswork to a large degree, and even your FS (who will be making educated guesses, but guesses nonetheless) may mix it up (dosage, days, etc) until it gets you ovulating. Which, remember, is all clomid does. It's an ovulation induction medication. It doesnt guarantee pregnancy. It merely helps you ovulate.
In closing, I think the best thing to do is relax. Call your FS tomorrow and follow their advice.
Good luck - and have a restful evening.
take care
n2l
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