Help! Intrusive thoughts 😔

I don't know where else to post this. I've only ever had sex with one man. My husband. And I KNOW my daughter is his.

Here's the problem.

She was born with red hair. My family carries that recessive gene though. No biggie. Until everyone started implying that I cheated. I know I didn't. Only ever been with my husband, anything sexual and I mean anything. We had sex in my ovulating window and I got pregnant.

But I suffer from severe anxiety and really bad intrusive thought. I know I've never been with anyone else.

But my mind irrationally started saying "what if you were drugged and raped" this makes NO sense. I was a stay at home wife and never left our apartment. No one was ever over. Ever. And this happened only a few weeks after our wedding when I ovulated.

But I cannot get this intrusive thought to go away, and the more I try to force it, the stronger it gets. She has a double hair crown (rare) and it's exactly like her dads. Has his exact baby teeth, and feet which is flat, hammer toe and a cross over toe. STILL the intrusive thoughts are endless.

Should I see a therapist? I know she's his, but the thoughts won't leave and it makes the intrusive thoughts stronger and makes the thoughts of "what if I was raped" even worse. My daughter has his traits though. But I'm drowning. I fight the thoughts harder but they won't leave.

Someone tell me what to do!