6.5 months pregnancy &tired of cardio

Hello, before pregnancy I became a gym junkie I lost 40 lbs after waiting 2 yrs to lose the weight I gained breastfeeding my 2nd child. I did a total transformation. I went from someone who would never step foot in the gym to feeling weird when I didn’t . I worked out 5 days a week and sometimes even did two a days. Fast forward I’m now 6.5 months pregnant. I workout 3 times a week and it’s been a breeze but last week I’ve had to really push myself to hit 20 mins of cardio. My body is really dreading cardio right now. I also life for about 45 mins. I believe cardio is more important during pregnancy.... right? Should I push myself to continue my routine or modify it to 15 mins of cardio and continue lifting or just do cardio and drop the lifting. In 2 more weeks I will be in my 3rd trimester. So far I have gained 12 lbs so I’m doing great which is why I’m thinking I should probably keep my cardio but maybes adjust it.