I am 45 m early heartbeat at times . now 7 weeks pregnant via ivf. yesterday after eating started feeling fluttering on an off all night. normal?

Not possible to say: The bottom line here, is you need to be checked out. At 45 your body is not as resilient as a 20 something, pregnancy is more of a physical challenge. In addition, the HCG molecule behaves biologically as if it were thyroid stimulating hormone, so women are mildly hyperthyroid during early pregnancy. That may cause arrhythmia and even a fib. You need to call OB,& an echo/cardiology consult per OB.