Flintstones vitamins to supplement pre-natals?

I have been taking prenatals while I was trying to concieve and then while I was pregnant. Im 4 months now and I recently ran out of my prenatals. I have bad anxiety with pills and cannot swallow big ones. When I bought new prenatals they were too big for me to swallow. I cant find the kind I had before. I know it sounds pathetic, I know in my head i wont choke but I cant swallow them. I know my baby needs its vitamins, so I want to know is it okay to take my sons chewable flintstones vitamins until I can find a prenatal I can swallow. The flintstones say to take 1 for kids and 2 for adults. I already purchased multiple prenatals trying to find small ones. I am still looking. So is this safe until I find sufficient ones?