Hello. I'm 40 And In The Process Or Trying To

Hello. I'm 40 and in the process or trying to have a baby. During sex, 3 days ago, I came down a little. It's that time for me to come on but after that, there has been nothing since. Now 3 days later we have been having sex everyday and no more signs of my period. Could having sex during this time be stopping it from coming down or is it possible I could be pregnant and that's why there are no more signs. Keep in mind I have 2 other children with whom I came on for months with them both before I realized I was pregnant. Please help. Thanks!