2 1/2 months postpartum MAYBE pregnant again ???

So I’m two and a half months postpartum I had my second period 6/22-6/28 me and my SO had sex on 7/2 7/3 and 7/4 which I think was my ovulation period just yesterday I signed into this app again put my period info in and it said there was a high chance of pregnancy two of those days well he tried pulling out but by the time he did that he came in me a little bit, well Ive been cramping since Friday 7/5 like my period is going to start but I don’t start that till the end of this month and my periods are regular can I possibly be pregnant again???

I need help!! Advice please!!!