I have not had an anterior placenta in the past, felt movement at 17 weeks and 12 weeks in my first and second pregnancies, respectively. I felt flutters from 10 weeks with this pregnancy, however when they couldn't find the heartbeat at 12 weeks tthey did a scan and typed anterior placenta in the report. No one talked to me about it. I have continued to feel light movement since, but not often and it is almost always down and to the side.
I felt my first proper kick at 16 weeks and maybe a small roll last night, but these seem more in the middle and on the other side. I am sure they will confirm my placenta position at my anatomy scan at 20 weeks.
I of course have the benefit of having had babies before and can recognise the difference between gas and baby easily. Soon you will know for sure as baby gets bigger and stronger.