PreWorkout Supplements

Okay, so I've always worked out on a regular basis... I've also always used pre workout supplements up until a little over a month ago to power through my workouts. Since my hubby and I are TTC I am hesitant to take any pre workout supplements... And then especially when that wonderful day comes we find out we're expecting! Do any of you use a pre workout while TTC/ during pregnancy? Have any of you found an alternative/ something natural that helps with energy and focus during your workout? This is all so new to me... 
** I am healthy and have no medical issues/history... I have seen my doctor and had all the basics checked. He has suggested continuing my workout plan while TTC and at this time doesn't see any warning signs that would suggest not being able to continue during pregnancy (other than some modifications) and well continue to reevaluate during that time.