Sophie, I first felt movements around 14wks and the sensation was similar to what you describe. The the tightness I just put down to everything in there stretching and moving to make room for bub as s/he grows.
the irregular pulse is likely to be baby moving around - i had that from about 9.5 weeks (very early!). the tightening feeling could be stretching, or might be braxton hicks contractions - my Ob said they happen all the time, but when you're pregnant some people start feeling them very early.
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