Bleeding 18 weeks

mommy2be

Yesterday I came into the ER and everything was good ! The baby was good , good heartbeat etc . They gave me a swab for infections , they did a wet prep ! Well when I got up this morning I had lower abdominal pain so I thought maybe it was gas (I still think it’s gas ) but I noticed spotting in my panties ! Could it be from the swab if so how much and long is it supposed to last?