Need advice

Firat of all i have pcos so my period is not "normal" Our twins were born june 30th 2017 at 33 weeks and are now 3.5 months old now, we never got on any form of birth control as my husband is against it. My period was never normal pre-pregnancy I had to take meds to induce period. And we had to use clomid to get pregnant with the twins.

After the twins I bled for 3 weeks stopped and then i got my period 3 weeks later. Then again after 3 weeks, so i thought that was my new norm, But now I haven't had a period and according to my period tracker I am 20 days "late" I have been having some symptoms that make ME think I may be pregnant again. But I took a few hpt and they were all negative.

I've been moody, boobs are sore have crazy amounts of discharge that is clear and slippery and sticky, period is late, I've been extra tired (I know that life with twins is exhausting but even more exhausted the past two weeks) then Tuesday I had a low fever and was so nauseous I went home sick and have been nauseous ever since. Last week I had what I thought was gonna be the start of my period with some light pink blood in my discharge that was also very stretchy and sticky. And these were all the same signs as she I found out for the twins.

The twins have also been acting weird extra clingy and whiny and keep wanting to cuddle my stomach. I have no clue if that's a real thing that babies can sense when you are pregnant or just a myth.

We are not actively trying so I didnt track ovulation or bbt or anything. and even though we aren't trying and this would be a crazy time for another baby I can't help but feel disappointed seeing the negative test. We tried for a while and needed fertility meds for the twins and it would be crazy if we unassisted got pregnant on "accident"

But the hpt keep being negative... So what else could this be? I need advice. I am going to the Dr for a physical tomorrow and am thinking of asking for a blood test just to be sure.