Very very light brown period??

My period in March and my current period in April (which I’m on now) have both been a very very light brown, not even enough to come on my pad. Only when I wipe. I usually use the flex disc during my periods and there was barely anything in there as well. They have both been very clear mucus and brown??? Anyone else experience this? Usually I have a medium blood flow to a heavy flow. Boyfriend and I have unprotected sex and he came inside me multiple times through March but hasn’t been since April. I’m at a loss. Haven’t tested yet because I am not a fertile person ever. Thoughts???