Partner won't have sex and we're trying to conceive

I have been with my boyfriend for almost 5 years and we have both always been open about the fact that we want children.

2 years ago he became ill with Bipolar and the medication he was on meant it was impossible for us to have sex.

Last year he came off this medication and we started trying for a baby but within a few weeks he became ill again, cancer this time. He's fine now. He had one dose of chemotherapy but again you're unable to try for a baby if you've recently had chemo.

Now he's been given the all clear to start trying. And we have been trying if you like since January this year.

My problem is that he very rarely wants sex. And even when he does it is 90 percent of the time me that has to initiate it.

He seems to think that you only need to have sex around the time you ovulate to get pregnant. I've told him we need to be doing it every 2 or 3 days.

I hear every excuse under the sun, too tired, can't relax, too full from dinner.

It's got to the point where I don't know if our relationship can get through this.

I have always wanted children my entire life. I'm now 30 years old and I have PCOS. I think I had an early miscarriage in March but then nothing since.

Part of me thinks I haven't got pregnant due to my Pcos but the other part of me thinks it's because we're not having sex enough.

It is getting me down so much every day I feel so depressed wondering if I will ever be able to have children. I've been referred to see a fertility specialist in October.

But I think what's the point in going when the problem is he won't to near me!!

I don't know what it is, I feel like it's me maybe he doesn't find me attractive. He says he does.

But I'm sick of the excuses.

I want a family and as silly as it might sound I feel like I'm running of time. Months become years and before you know it, no children.

He says he wants children but there seems to be no urgency with him. He's younger than me and no fertility issues.

I feel like our relationship can't carry on we keep arguing over this all the time.

Has anyone experienced this or similar?