No I wouldn't say a 'must'...It depends on your reaction to the cycle. Did you experience gyno on your first cycle? And, did you take proviron then?

your PCT is wrong

100mg ed for 2 weeks and then 50mg ed for 2 weeks

I would rather use nolva for PCT for two reasons first 20mg nolva does thesame as 150mg of Clomid and Clomid is bad for LH response.

Fertil Steril. 1978 Mar;29(3):320-7.
Hormonal effects of an antiestrogen, tamoxifen, in normal and oligospermic men.

Vermeulen A,
Comhaire F.
The administration of tamoxifen, 20 mg/day for 10 days, to normal males produced a moderate increase in luteinizing hormone (LH), follicle-stimulating hormone (FSH), testosterone, and estradiol levels, comparable to the effect of 150 mg of clomiphene citrate (Clomid). However, whereas Clomid produced a decrease in the LH response to LH-releasing hormone (LHRH), no such effect was seen after the administration of tamoxifen. In fact, prolonged treatment (6 weeks) with tamoxifen significantly increased the LH response to LHRL. Treatment of patients with "idiopathic" oligospermia for 6 to 9 months resulted in a significant increase in gonadotropin, testosterone, and estradiol levels. A significant increase in sperm density was observed only in subjects with oligospermia below 20 X 10(6)/ml and normal basal FSH levels. When basal FSH levels were increased or oligospermia was moderate (greater than 20 X 10(6)/ml); no effect on sperm density was seen. As sperm density increased, FSH levels decreased, suggesting an inhibin effect. Sperm motility was not improved by tamoxifen treatment. In five boys with delayed puberty, tamoxifen treatment appeared to activate the pituitary-gonadal axis and pubertal development.
PMID: 640052 [PubMed - indexed for MEDLINE]


"However, whereas Clomid produced a decrease in the LH response to LH-releasing hormone (LHRH),"...Not so good

Personally, I dont respond positively to Clomid. nolva does the job well.

if im using Nolvadex in this cycle . how many milligrams i need for this simple cycle??thanks .