HELP MEEE

Okay so I'm on the pill and I take it everyday around the same time. When my SO and I have sex he goes like 3-7 times and all of the times I let him cum inside me. I went to the doctor for a head issue and when she asked if I could be pregnant I said I wasn't sure and she acted like i couldn't be as long as I haven't missed any pills. Is this true, and if I am pregnant do I miss the period I'm about to get at the end of the month or one later down the road?