Im 7 months pp but .. takes alot for me to get in the "mood"

So the biggest issue in my marriage is SEX .... Which I don't necessarily know why cause we do it twice a day .... But I don't necessarily care to even have sex kind of just go with the flow ... Because my husband feels neglected if it's longer than 2 or 3 days side note we had to get over infidelity that occurred during the 6week wait PP .... I'm also worried because he has baby fever ALREADY and I don't ..... And he works 2. Jobs soooooo basically it would be just me of course .... Sorry for the lengthy post