My lower belly kinda pulsing like theres bubble inside is this normal? Preg? Last sex 4mths ago had 5 periods & all PT negative. I'm not thin

Pregnancy unlikely. A woman who has her normal regular menstrual period is not pregnant. If she has a second normal regular period, that again confirms she is not pregnant. One home pregnancy test done at least 3 weeks after sex, will also confirm non-pregnancy if the test result is negative.