how to know if you’re actually in labor?

Hi guys, 23 y/o soon to be FTM here. Currently 38+3. On Friday I had my first cervix check (ouch!!) and I was told that I was barely 1cm. Over this weekend, I’ve lost my mucus plug and had brownish discharge, I texted my OB and she said this is normal & she doesn’t really worry about the mucus plug because people can lose it at anytime during pregnancy even multiple times. This afternoon I had a sharp pain in my stomach while grocery shopping that made me stop walking and just hold my stomach and breathe until it went away. Tonight for the past hour or so, I’ve had about 6-7 tightening sensations around my entire stomach + lower abdomen with pressure and lightening crotch (funny term lol) that lasts around 1-2 minutes, goes away then comes back. It’s not really that painful as the sensation from while I was shopping, but enough to make me worry a bit. How do I know if this is just Braxton hicks or actual contractions that would require me to go be seen? I feel dumb asking and I’d feel even dumber going up there for nothing. My OB said she would like to induce me at 40+1 and we’re not too far from there. I’ve been using the ball, raspberry tea and I still work full time on my feet. Baby boy has been less active but my OB said this is normal as well since we’re getting closer