Have you had difficulty getting pregnant for a second or their child?

I had two girl back to back after trying for almost a year, they are 15 months apart and will be 3 & 4 this year! I been trying for months now to get pregnant the third time trying for my boy but it’s been such a struggle.

I’d be so sure that this month is it but then I get my period either right on time or either 7 days late but I get it.

I’m 24 and I have time and shouldn’t stress but I want a big family and I want to stop having kids after I hit 30. I do struggle with pcos, I do take Metformin for pcos which has helped my periods get regular (most months) but it hasn’t helped me get pregnant.

Are there any vitamins or any other suggestions you can give that I can try.

I am sexually active esp when I ovulate and I know when I ovulate because I been trying for a child for months now and I know when my body is ovulating (my ovulation comes with extreme mood swings esp sadness/depression, cramps, headaches, and bloating ) I even tried this month had sex 1 day before ovulation and 1 day after and then 2 days later. Idk if I should only have it once during ovulation week or what, I wish it wasn’t this hard 😐